Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b7f4618c3ceb25…

MALICIOUS

PDF

77.4 KB Created: 2021-03-31 21:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4ea57f1cba49f584d97702108d4a2b2 SHA-1: 79d00a7468185c3825826f993eb63931a5865e61 SHA-256: 97b7f4618c3ceb25d7ffef33372dececb1a641b9760117dbf1844cb59d738912
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=chevalier+college+performing+arts+centre
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5ff005cbe673a.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_603686c08c2d5.pdf
    • https://static.s123-cdn-static.com/uploads/4493916/normal_5fc6b5051bd65.pdf
    • https://static.s123-cdn-static.com/uploads/4413564/normal_5fe468e8ad46c.pdf
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fd9a22f777cf.pdf
    • http://kononameve.mywebcommunity.org/71038602564.pdf
    • http://kaxiwemusemoj.mypressonline.com/26419315918.pdf
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5fe2cc65149ac.pdf
    • https://static.s123-cdn-static.com/uploads/4416653/normal_5fec819791ee5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_17fffc385c7143c49d3140b2dfaab5f5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/035142ff-c90f-4025-ab8b-def47d448ae9/how_can_i_learn_how_the_stock_market_works.pdf
    • https://uploads.strikinglycdn.com/files/26e6419f-3151-45e6-87b4-08618365cf35/sivagobelixefo.pdf
    • https://uploads.strikinglycdn.com/files/dfea2b3c-aeb9-40ce-9208-7803a5734de9/how_much_fl_studio_cost_in_india.pdf
    • https://uploads.strikinglycdn.com/files/91e9dc51-fcae-40b3-b160-575cc4662132/kejopaburuxubuxu.pdf
    • https://s3.amazonaws.com/mogipegi/convert_audio_to_midi_logic_pro.pdf
    • https://uploads.strikinglycdn.com/files/5ff6e615-1719-42f4-ba30-88764bfb5e22/gobivivumiludagala.pdf
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_38b3a3b9f8c84be5bcc6386311dbcc4c.pdf?index=true
    • http://zibelasavu.atwebpages.com/dabarifod.pdf
    • https://s3.amazonaws.com/vuxagixil/mudobesemop.pdf
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_7f7e4f6c34b04e3ab65fe2266a901fef.pdf?index=true
    • https://s3.amazonaws.com/jusuberu/54350277187.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf0.bin
e19d0482ac1224b304822a45a63392a6eded6b6223c78a1cefd09d5f7dfae7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 5396 bytes
font_01_sfnt_off00010023.bin
b9da4841efab10bef628dcdc74f13ad7aef6916968ce9d0764cf869df983f9c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 12056 bytes

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