Malicious PDF — malware analysis report

Static analysis result for SHA-256 408ab2ad6f8da124…

MALICIOUS

PDF

88.3 KB Created: 2021-05-22 22:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c37a71f0595ce2b9c986bdd7f3405e57 SHA-1: d0a146a4a10fd3924d06d12e1d97c8091a4a16d4 SHA-256: 408ab2ad6f8da1247e1014644535283f0b21cb55a9a93416d3ea49b45e374c1d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary IOC is the initial URL used to access this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=postmortem+lividity+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462368/normal_606126a98bf6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_604d041997b59.pdfIn PDF document text
    • https://tatilimaju.weebly.com/uploads/1/3/4/4/134464449/dijadalasojifive.pdfIn PDF document text
    • https://wipukanutunuk.weebly.com/uploads/1/3/1/4/131437017/1173106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385230/normal_5fe08626c01ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_604f424e1b319.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/8944315.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/509036.pdfIn PDF document text
    • https://milorali.weebly.com/uploads/1/3/5/9/135965765/9383357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457014/normal_606735d0e5d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_60267ce5dfd86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_60335341490c9.pdfIn PDF document text
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/ponuluza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366031/normal_5ff9ba9d2c390.pdfIn PDF document text
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/1512880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_601f691cdd85c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486344/normal_605f78ecc1b35.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/senodiw/leyes_laborales_puerto_rico_dias_por_enfermedad.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/zoxekobata.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/vectors_vs_scalars_worksheet.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_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 5140 bytes
SHA-256: 0e334ba1a819c2b0281c7b75670c2c23b3637c2dcdbd898fcb3b75e7ea33e393
font_01_sfnt_off00012d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 11000 bytes
SHA-256: bd7c24941c7a2a9bc133768f3b6c3cb7dca06f82a88e69162d703bed77edfe42

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