Malicious PDF — malware analysis report

Static analysis result for SHA-256 587166a8849d339e…

MALICIOUS

PDF

62.8 KB Created: 2020-12-19 07:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f4ca508127248ed4177f54335ded864 SHA-1: 1c71f5ef601310dfe02b7495ffe28235581bd840 SHA-256: 587166a8849d339e19fbe1bd0046ae483dffb3f6c445a2acaefe85c6065cf2f9
156 Risk Score

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 phishing or trojan payload. The document contains a large number of external links, many pointing to other PDF files, suggesting a link farm designed to manipulate search engine results for terms like 'the dirt motley crue book free download pdf'. The primary malicious IOC is the initial URL which appears to be a redirector.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=the+dirt+motley+crue+book+free+download+pdf
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/8732747.pdf
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/4189067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0ea36f7cf8c75402afe56/t/5fcc606ce43f2b00a89eda70/1607229549880/bejopinobuvijomalaxubop.pdf
    • https://uploads.strikinglycdn.com/files/a71966b6-64ce-4511-92df-7bab105b65f0/33044130326.pdf
    • https://uploads.strikinglycdn.com/files/476a1b45-e739-4117-bf1b-4057a60614a9/guide_raccoon_hv.pdf
    • https://static1.squarespace.com/static/5fdd2a4ad7fbea164c2cd181/t/5fdd5283c18bd5077c875721/1608340100093/bastenski_sto_i_stolice_forma_ideale.pdf
    • https://uploads.strikinglycdn.com/files/eb60ea9c-1c66-40f2-8414-c2554e771a8a/gefumenulegufureko.pdf
    • https://static1.squarespace.com/static/5fc4f91fa3bf4b14abc32683/t/5fd00ef17b0a801071fe75c4/1607470835976/the_russian_physiologist_ivan_pavlov_discovered_that.pdf
    • https://static1.squarespace.com/static/5fdd458912e20d66685e56d5/t/5fdd54921c66f52f5f70a519/1608340629485/27338516678.pdf
    • https://uploads.strikinglycdn.com/files/7e5cc8e9-3e56-4969-9f60-2a8940725a58/76508964624.pdf
    • https://uploads.strikinglycdn.com/files/d2118cb3-402d-4410-b0c1-8c9a82083b96/74939453886.pdf
    • https://uploads.strikinglycdn.com/files/b77c245a-87e1-4e39-8055-ace4c15bafb6/6361920387.pdf
    • https://static1.squarespace.com/static/5fc174bfa5bc066edfa992ec/t/5fc40b374f983757205dd8ef/1606683450041/ruril.pdf
    • https://uploads.strikinglycdn.com/files/4dc235fd-9bec-42b0-af6b-c6529811ccf9/vexanedobipetatewojadi.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_off0000b7b7.bin
dca15b5ac3aecd605e6fcf5af3e2295f4850c0e3ba1b5903b80acabfe93352cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B7 5564 bytes
font_01_sfnt_off0000ca92.bin
813b98c59f0d51d9d2a29e6e012e03767bb248f2b56ceaea4e36e34726e0a6bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 10604 bytes

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