Malicious PDF — malware analysis report

Static analysis result for SHA-256 0636706d1f2bf846…

MALICIOUS

PDF

92.0 KB Created: 2021-01-24 16:07:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f112df1962f60e349e86212574564f62 SHA-1: a76d8fddfc0d94c770376a538764b4e219f004da SHA-256: 0636706d1f2bf846368c26263a617e733237d116339e82190c4bb50b18e97264
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam, by directing users to potentially harmful websites. No scripts were extracted, but the presence of external URIs and the 'link farm' heuristic suggest an attempt to redirect users for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/wb?keyword=homebound%20sheets%20review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5fe5efd6cb4d5.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/zWic0hg/98864406012.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/68054993248.pdfIn PDF document text
    • https://kogijusixi.weebly.com/uploads/1/3/5/3/135312463/49a794380e38881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476011/normal_5fee3732e8f37.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/parur.pdfIn PDF document text
    • https://saxoxukodumixab.weebly.com/uploads/1/3/4/6/134635675/sipelolodajezij_jewalubixero.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409797/normal_5ff6c0e10fbb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5fe94888dc7dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ladorum.epizy.com/90486070732.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/40515456695.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/16190496154.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/explosion_sound_effect_for_dance.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_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 5076 bytes
SHA-256: bab8f721be1001b66162032926326a6e8e10ca19be89ca759497affc6578719a
font_01_sfnt_off00013f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F32 10548 bytes
SHA-256: e670b2be98f087075e4bad4d2940adbadb17509ee2ea0031d5f2f7fcb5e450bc

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