Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f465a82d9ef7d8…

MALICIOUS

PDF

61.7 KB Created: 2020-11-25 14:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 478e8fc351c96586419ab79b35121f43 SHA-1: 12489afbf38333ecdb4a3206b489a96fbacdae15 SHA-256: d4f465a82d9ef7d8561f91ba65060dcf928846c006194ede1503170095558e34
164 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many pointing to other PDF files. This suggests a link farm or phishing campaign designed to redirect users to malicious content. The presence of a "download" lure further supports this. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a likely attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=catering+menu+template+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387577/normal_5fa445f757625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5f94f3b553e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_5f9b14c234acc.pdfIn PDF document text
    • https://lepebixetuvenal.weebly.com/uploads/1/3/4/6/134634058/buvowukowiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_5fbab064bf380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_5fa083eee1394.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/zamobolujakufun-xumubo-nujupuganez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_5fac31d538ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_5f99a2544187d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f8999d8daafc.pdfIn PDF document text
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/8bd70e8d17b.pdfIn PDF document text
    • https://rexavinuzuna.weebly.com/uploads/1/3/4/3/134308075/d9ac5099168dd2.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/kidorulajekosu-zilumevi-tegobowobuzasu-gokewipobitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5fa58b5190577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/26734490049.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_off0000b6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C4 4948 bytes
SHA-256: 755dc1e8488e7321c389d42c41d7b083354a79572b1be405d34d7a17216435a8
font_01_sfnt_off0000c785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 10224 bytes
SHA-256: bd93a580a096e2561769bfc24dce9dcc4bbe5ad2224f032724b837d90806d401

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