Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4f94751700c152…

MALICIOUS

PDF

67.3 KB Created: 2020-12-01 15:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 30efa900683f1001ddb82d9327617516 SHA-1: 5fade39c6b22a65788faa281c1ae79d2f5451582 SHA-256: bf4f94751700c15203c3a3ea21f01654d24d25bb5dfa2cfcadaa724083d8012f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL points to a page that appears to be a lure for 'the dark ages worksheet answer key'. The presence of multiple Weebly-hosted PDF links suggests a coordinated effort to direct users to potentially malicious content. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

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=the+dark+ages+worksheet+answer+key PDF link annotation
    • https://bavifogo.weebly.com/uploads/1/3/4/5/134524367/jaruninajikasenum.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/4172681.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/85f858e5cc8b.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/bfdba3fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1573bc819f1cf4a0a062/1606292851920/usability_testing_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18f8d0a2757459be7919f/t/5fc400ae4e98326c028da1bc/1606680750777/5284627266.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bcfb2e537a05ef083615/t/5fc3508b9d79364840f8079a/1606635664054/gibepesuzirunufagexu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fb036b97992eb55c812d/t/5fc510f361e25426e1d81d46/1606750459082/reglamentos_basicos_del_basquetbol.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/pdf_annotator_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/honda_prelude_manual_transmission_oil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc296788787e8798976c150/t/5fc3e2559b1ed0353854a9cb/1606672982026/pixel_art_character_base.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3aed99955c744b54ce5b8/t/5fc62dcd3485235c86997b68/1606823373973/pivubefejajinesobug.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_off0000ca01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 5260 bytes
SHA-256: eb277d4d29ae1663f8684860b099d46223d730f3ab7413a48500962bc306d0cb
font_01_sfnt_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 10744 bytes
SHA-256: 76c0fae90537bf30fdfe5edb5bec378a70ee57ac2df91ba3195fe455c8520e31

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