Malicious PDF — malware analysis report

Static analysis result for SHA-256 9842fb01bdad3bc1…

MALICIOUS

PDF

145.7 KB Created: 2021-04-30 20:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fd740637fd0238d8fd6eb2f514f25716 SHA-1: b3f0b2a0f681adbe04337b4f5183eb8566bb2916 SHA-256: 9842fb01bdad3bc1360a588eb720f4f5660299c607ecaea3f8373824e97a9a4e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://vilenefex.ru/strik?utm_term=army+new+marksmanship+qualification+course PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493553/normal_6052799717dbe.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/hj50jgv/27031855961.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/gdFjjff/pozabunepuxotiwax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_6039ca78c466f.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/3hcdhiA/idler_roller_coaster_free_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_604623025a9d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_600138d3cb269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_601518d8382d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5fc5734e49971.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/Zlii3yt/glitter_slime_videos_for_toddlers.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/TojbHhh/20716228454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_600d8606529e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_6050c5497e110.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/42862895724.pdfIn PDF document text
    • https://cdn.sqhk.co/xizojotozodi/bhijap4/99509425482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_bde853d2564d43d98350a4f38de42f83.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_f1cad5004a7948aca003af157be12796.pdf?index=trueIn PDF document text
    • http://wovibojo.onlinewebshop.net/crompton_greaves_ceiling_fan_catalogue.pdfIn PDF document text
    • https://bc3ee532-4344-4262-9f0b-d8353e2229a5.filesusr.com/ugd/6ca3f6_804fd54e7d124e51b40c190753d435ea.pdf?index=trueIn 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_off0001e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9D5 5628 bytes
SHA-256: 24b646fa1b476591c7219cf8d62b1bda456ecdbb5f0ec44be02138442832becc
font_01_sfnt_off0001fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCED 11424 bytes
SHA-256: 50c6a56797fff3873e55c91c5f77e6e9544b3a47cf85a1161af08a7a53fd3964
font_02_sfnt_off00022404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22404 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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