Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a0e4904a38bff6…

MALICIOUS

PDF

68.0 KB Created: 2021-04-03 01:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 940878ba3aabbcd6679b510a4d5e93d9 SHA-1: 390a003751ba90e369b47253de76df776a611b3f SHA-256: 39a0e4904a38bff66e9702011581f1a6723d23153f5b5b0753374bd9a8b83142
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. While no scripts were directly extracted, the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=mole+to+mole+conversions+worksheet
    • http://wokulorumal.iblogger.org/emulator_for_pokemon_light_platinum.pdf
    • http://ig-copyrightnoticehelp.com/rikogorufabonarine2dn45.pdf
    • http://regsenatvumen.website/jpg_to_online_merger1jq3h.pdf
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/nifetisaxufewox.pdf
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/xipapuganaz.pdf
    • http://autocredit.moscow/saint_augustine_confessions_henry_chadwick_audio6zkor.pdf
    • https://zuvexege.weebly.com/uploads/1/3/0/8/130814851/867263.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_2e370f89527c48ad813c2404379f0d12.pdf?index=true
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_a34ad5dfb6e84af3834c7291c17e14e5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f84370ae-ed41-4a37-b969-6f8aff48d86d/3525992803.pdf
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_108f73a58daa41d5ae486108ca0464c6.pdf?index=true
    • http://vudamup.rf.gd/98587581142.pdf
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_19eb5bc59d7b4a33a8bcaef4c2a4678a.pdf?index=true
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_a61a7f7d35344d46a80be548ecd0d69f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac9f8d3a-46cd-43c3-9a54-cf8c80c0d95a/jubow.pdf
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_a6bb35b02aec41da9d00f88cbb8bc908.pdf?index=true
    • 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_off0000ce34.bin
b56d6dd552e9dfe38953d13b18c6723f428e3dfdfb8da1c3cfe2906af9e274b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 5048 bytes
font_01_sfnt_off0000df59.bin
00f5a8fcc38ce9afd7ef339ecafc6f1b9b9f72988a77141ace536d4ac5318aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 10516 bytes

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