Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2b0521771e7463…

MALICIOUS

PDF

74.1 KB Created: 2021-01-17 08:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 533975eb231c3a589803552af8517a2e SHA-1: b7c330c1e8a54fa44c7e208027bed028d5284f09 SHA-256: bf2b0521771e7463125e9ce63ba8b6e187e412043df355065aaeacee9b927cb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing or SEO spam campaign, indicated by the presence of a large number of external links, many pointing to PDF files hosted on various platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a tactic of distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=tntt+morse+code PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466391/normal_5ff0cce3bbccd.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/4693716.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/3608712.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/83c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fb328d9bdd7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f87643a9ceec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465388/normal_5fee7e40214b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420260/normal_5fe1d4651fbc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5ff9880b94893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_5fe7f6007c416.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368964/normal_5ff9ac512aacf.pdfIn PDF document text
    • https://pedamajemekiju.weebly.com/uploads/1/3/1/3/131380885/a9c445d79b08301.pdfIn PDF document text
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/577576d4e5cc.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 4792 bytes
SHA-256: 132d2b31e4fc72324d7f21d01740db630b152b747e0d859f6784f2c37c633efb
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 11876 bytes
SHA-256: 89766814b95ae14e624399678923cfb6a312e563a3676884ef43790c867db835

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