Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c82f8576e0750a7…

MALICIOUS

PDF

72.9 KB Created: 2021-01-16 12:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 83f28e2feb217e141f861e3ed6d4315f SHA-1: 7eb6404565a51d0e81b96ea1a036e957cab03518 SHA-256: 9c82f8576e0750a70d70faca5496a379fdf796523d6abe4c5da3d4c91083a189
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of external URIs and a link farm heuristic strongly suggests this document is part of a larger distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=chemguide+boiling+points+of+carboxylic+acids PDF link annotation
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/f75d0a3.pdfIn PDF document text
    • https://kukavijeri.weebly.com/uploads/1/3/3/9/133997324/noxuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fa1be94bf46c.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/5322233.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/1902180.pdfIn PDF document text
    • https://wapapoda.weebly.com/uploads/1/3/4/5/134581042/sosuxijinubasefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5f8ca3e6ddec7.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/1373870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5fbf0a8c8423b.pdfIn PDF document text
    • https://zubukuxazepezox.weebly.com/uploads/1/3/4/6/134600429/mosaraxokotonos_gegarosanosapet.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/be094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5faabcdd19d3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f91b5238574d.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/xamibebulosaxug/30344554585.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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 5784 bytes
SHA-256: 5ee2d43f1e5ea5fe74186d55838a617940d03872d6e28b69c47751972f05480f
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 11148 bytes
SHA-256: 66af04f94c330d68c6069da13150a76a13c9c2da2191624151f21f725f24edf1

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