Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b971da10269376c…

MALICIOUS

PDF

68.5 KB Created: 2021-01-11 12:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2a8b1c253ca7c572835fb60a9ced1d11 SHA-1: cc114fab33f3a72ad46e3708bcc133fa31fa39b0 SHA-256: 9b971da10269376c1abcafa4f19ab459aa30ae19ba7972ab2fb186a9b511b44f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to a 'Recruitment and selection at enterprise rent-a-car case study solution', which is likely a pretext to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=recruitment+and+selection+at+enterprise+rent-a-car+case+study+solution PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5ff389496b150.pdfIn PDF document text
    • https://nifabixiguwo.weebly.com/uploads/1/3/5/2/135295020/neginozoxunifineju.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/5701673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457311/normal_5fef4e0a2517c.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/1025098.pdfIn PDF document text
    • https://nobujowufovipi.weebly.com/uploads/1/3/4/6/134636268/biluxegogumiman-dubivesedu.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/kujijumafaban.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/J8sjfLV/31187670979.pdfIn PDF document text
    • https://vajipexinonadol.weebly.com/uploads/1/3/4/0/134096003/povulezolanozisejuw.pdfIn PDF document text
    • https://seranogi.weebly.com/uploads/1/3/4/2/134265977/de8d3f8b9f371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5f98a2a319353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_5fdc40f7ae180.pdfIn PDF document text
    • https://nefovevetovuj.weebly.com/uploads/1/3/5/3/135390951/7078281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_5faaedc3141db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 5360 bytes
SHA-256: 5c2e5766580d76bde9ffd5cb82eb1bf6758eed55258f9ad764059503e45027a4
font_01_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 10252 bytes
SHA-256: e71b4780cf1e7f0d20c3e3f6ea960c745edd4f037232ee0f7177c93c858b37bd

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