Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a132ee160def31…

MALICIOUS

PDF

119.0 KB Created: 2021-03-09 00:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 64d9a7fba999eec301009b882ec1b469 SHA-1: 0bcb8e503e553c0029038faab55f7e9737c3f5ec SHA-256: c5a132ee160def31360940a1351fb8b355df50dbb2b50380bfb93d292a35d3d2
134 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. It uses an urgency-based lure. 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 0.9999

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xajibur.ru/123?utm_term=balance+of+payment+pdf+file PDF link annotation
    • http://bathforlegs.xyz/kosowiwenejutamwogm2.pdfIn PDF document text
    • http://midoponivejumod.22web.org/jabefivejezibigevaridelen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_600df5930a984.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/how_to_lean_body_mass.pdfIn PDF document text
    • http://foxujosavubisi.22web.org/moladatatugutomulejugebu.pdfIn PDF document text
    • http://fullstacket.online/6322784251830jnu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5fc831ea2c29d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/essential_computational_fluid_dynamics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981dc6c9-e8fb-4a0c-b8d5-0ede0f5d4628/does_sears_still_sell_kit_homes.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/11419600620.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/gattu_naresh_bajana_songs_naa_songs_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/where_did_the_saying_mutt_and_jeff_come_from.pdfIn PDF document text
    • http://keberefan.rf.gd/bajrangbali_wallpaper_photo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde751f4-15dd-44d0-aa39-087249f3c20e/49577494158.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/ralph_waldo_emerson_self_reliance_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a70cf80-e9ca-4941-aec5-1b5a2444842f/does_verizon_have_flip_phones_for_seniors.pdfIn PDF document text
    • http://sewejatoxomo.rf.gd/tuzuzuvolegijogu.pdfIn PDF document text
    • http://zefinut.rf.gd/nuxunakewamudujiji.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001939f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1939F 5180 bytes
SHA-256: c43db29ec3d1d10e7f1707bbe76e4cbabe43576dd28a3d82ec01ff63fe93190e
font_01_sfnt_off0001a541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A541 12656 bytes
SHA-256: f90cf1d86482b300d40d91f538ec38e8aa0736964f9c7e328e8d7558c8a39fbf

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