Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9120a397bbbee2…

MALICIOUS

PDF

74.0 KB Created: 2020-11-11 18:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 700734fe98bee08dd50a69b10bf12fa1 SHA-1: e210a09aed293b86332fac2242d4226d292663e4 SHA-256: 9c9120a397bbbee2140e450af78b392cf6eb7d875c9ee8a12a68b3cb888c2721
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a mass external PDF link farm, with one primary malicious URL identified as trafffe.ru. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which aligns with the link farm technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=what+is+4+pi+epsilon+naught PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391308/normal_5f99b504b5b10.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/d82f3229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_5f929f9016254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f8bc4cc76465.pdfIn PDF document text
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/nejajedafubokub-pusoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_5fa55c8d62fc9.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/terojuxet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f92b2e2e521a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5f8d7b4839c24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_5fa08f1834342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b8f260-3cc1-4be4-942a-5a6890324b16/technic_launcher_cracked_change_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4cccd8-2b3d-4162-8be2-7b3f3b93fe8c/70253479391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5e4b82-9b6a-46a3-8e92-4d98b0a26386/scott_mccloud_understanding_comics_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5719ae-79c3-48e5-b6b9-9f8a4866c728/33367531125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66c0253-cb70-4ea1-9640-09dae673a8f5/gunokifagojuxiwoxiwumax.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_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 5084 bytes
SHA-256: 0859c16f3584b3d9453e7a024ef62e0ea63d4f191d2cdb1ca783853410dc2a41
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 12628 bytes
SHA-256: bf46e9c64f18974955c8e1617784eea7b4dd189f01940fc244ed3a76afe5578f

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