Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e2881b4417df47…

MALICIOUS

PDF

88.5 KB Created: 2021-03-17 04:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b9b13065fda7f2fefb30dfb5a724dc7 SHA-1: b84ebb93393615664625eaa4afaa160b93e26b59 SHA-256: c7e2881b4417df471c9f350712a87befa67b1334ec2a8b2c102f39b37d63ec64
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of 'powershell_commands.pdf' in the document text heuristics suggests potential execution of commands, possibly via embedded JavaScript, to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/award?keyword=c+or+k+spelling+rule+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462727/normal_602d8a7365ed9.pdfIn PDF document text
    • http://about-fb-support.com/blue_bossa_kenny_dorham_solonn697.pdfIn PDF document text
    • http://businessoutsourcing.org/69699665858qpxzt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_6042eede0c33a.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/62babad3.pdfIn PDF document text
    • http://hellesypakk.online/62440259344dgoya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_5fe911fd8f47a.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/7dd42b964f28.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/4475423.pdfIn macro / runtime command snippet
    • https://gevuloluwalew.weebly.com/uploads/1/3/1/1/131163761/nujomo-balovixuzekem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5ff4bd6ec66ef.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada01644-5e87-45ff-80c3-15f1f21907dd/ilive_sound_bar_codes.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_a0258b8679ef419d8fd85557aeb7eb4a.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_054519e629b34d7cbacaf6189d822f50.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_caea9980e0b54a62897fad90d1456698.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_86d625b7d5894229893db12e82a84299.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_042a7b546dea45a487c3676ae440cfeb.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_d52399ecbf324925b965703d201473ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4718ee6f-afd3-4dd4-86d3-d28da9b34c9b/the_birchbark_house_chapter_10_summary.pdfIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_67146c72eae54c8da1cb49e6820416a3.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_d4d15b54241a432a9e16779dcfbfaaef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/264663a7-5ec7-4712-83c6-00a1482ddcbb/27179722528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f81c36c-505b-4ea4-93f5-a1d3dd035cfb/win_10_powershell_commands.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 5152 bytes
SHA-256: 712c9db60378cd218216725368a4fbcbbbba05c12aced3835a941868a5f24032
font_01_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 12512 bytes
SHA-256: f0d73c8eed7970754902029e9d3793052c9054c498df6d68a6f27d34b272c7ad
font_02_sfnt_off00013e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E49 16196 bytes
SHA-256: 48ac7198f28dc3fa3012b55bda75cbece6f945fce55f89abda61e9b3a94784ed

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