Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfaf116f022d5e0…

MALICIOUS

PDF

64.4 KB Created: 2020-12-20 15:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bc7bdc631dc962fc6a0275fff1810d0c SHA-1: 1d2ef668b8cc91364638dc9fc7672cfb03c8faca SHA-256: 1dfaf116f022d5e08ccd7d3edf3aa8d8b6ba1cf285fab693980965e4db9b7131
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/strik?utm_term=cobra+cxt345+manual PDF link annotation
    • https://xazaguzomolak.weebly.com/uploads/1/3/4/3/134375957/84d59abb3964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_5faaf88569fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401711/normal_5f9cf3af51832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f9bb91bf2361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_5fa987eadbbef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459796/normal_5fb500ef7d7e8.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/5fc7ab2463393450185574c8/t/5fcee9428b174454e99197ea/1607395651921/nejidevexufomolof.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28a8211f6a41984901fa4/t/5fcd6083260a660a6bed2483/1607295109779/85231760688.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc69b6fdf132613bbe520e9/t/5fc828d792e74531f3c089ac/1606953175307/60576616086.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/35421894061.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_off0000bb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB40 5256 bytes
SHA-256: 686a711bc1291a34cbf654e9de8281f2b826c54c6b519f391f296a8472ece9cd
font_01_sfnt_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 11824 bytes
SHA-256: 6994dc7fb422791c27bb957348fdcff1c299a8ab59340a6dc4cae706a99ac48e