Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9b68d857373c2c…

MALICIOUS

PDF

104.5 KB Created: 2021-01-02 10:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 83c1d5f79c097607b79aa93402e3c9c9 SHA-1: deda63c630cf59a152a37e38ca95684d48ed7e27 SHA-256: 2d9b68d857373c2c4a02ee56bd3637501d5235299cdece1e9a647f8f4696b2fc
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a "PDF_SEO_LINK_FARM", indicating a large number of external links embedded within the document. The document body, though heavily obfuscated, contains text suggesting it is a "Fb commissions rocket guide", likely a lure. The presence of numerous unknown reputation URLs, including one directly linked to the "link farm" heuristic, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=fb+commissions+rocket+guide PDF link annotation
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/vadoroluj.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/ijdjahe/prison_break_cast_season_4_episode_16.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/ahiXLgj/cruise_jobs_hiring_now.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/Yjuz1ZE/60741333501.pdfIn PDF document text
    • https://bugadubotureje.weebly.com/uploads/1/3/4/4/134468403/8028447.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/zicuije/77855456950.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/cNggfva/exoplanets_3d_lite_stroller.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/364c23c.pdfIn PDF document text
    • https://zumekaxiligub.weebly.com/uploads/1/3/5/3/135385258/8113930.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/daf8ba20-b09f-4fe1-bb1b-ae356c54dcd9/31376895523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0786294b-5ce3-4510-89ef-dac6cc3179d7/xewufodagalutibomigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4316e719-e585-402b-985b-d21fc115443b/we_sell_mats_4x8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af35680e-0ec7-4937-801a-877c18e8ecd9/rululag.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/bojapubujikavifusomidek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/335d69af-6c63-4221-b602-f97036ca5416/zimivunuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/hansen_elementary_school_teachers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c9c4f9-c741-46d1-a4f8-07f8d98d346d/who_in_sign_language_video.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_off00015c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C38 5176 bytes
SHA-256: 2c93b5c12bf70606924b573aa1593c902835a0dabb04a21ee55e45800a42ce81
font_01_sfnt_off00016dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC5 11448 bytes
SHA-256: c4aeed7a49658fd8746bef27f8d02cd50024752c8e4904d3f37968e731f8278a

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