Malicious PDF — malware analysis report

Static analysis result for SHA-256 317941731b43f6d7…

MALICIOUS

PDF

74.8 KB Created: 2021-05-30 04:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cef77b15f68fe7171c67d465e9a86801 SHA-1: 4ba15192a570fe0ddb8e6bfe5f4653d754a45346 SHA-256: 317941731b43f6d70f2258c1606e9f9ad3a5aa64e2e43c83cb6e68fdbd858248
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://lozipotod.ru/123?utm_term=alkenes+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460950/normal_5fd684545b688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_5fe728be1f832.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/9693378.pdfIn PDF document text
    • https://mabedokuk.weebly.com/uploads/1/3/4/5/134582143/fewogoxivi-subekajopasinox-pajime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467004/normal_5fc648cd7901f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404529/normal_5feb9c0517e10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469631/normal_6001c4039af7a.pdfIn PDF document text
    • https://vaxofawaz.weebly.com/uploads/1/3/2/6/132682661/nagule_numilurofor.pdfIn PDF document text
    • https://jiwazakamofefuf.weebly.com/uploads/1/3/4/0/134041011/piruzoxelaba.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/1298389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_602084239906d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_606a950a4a615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_600c012962caa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366987/normal_5fe4d573ce645.pdfIn PDF document text
    • https://dedetalorisa.weebly.com/uploads/1/3/4/5/134593476/tadelor_tavuserukosevi_nikefipaned.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d034e2-fbdc-4bee-87cb-4f0662ea81ad/51957131810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f633402-de23-4c39-b3f0-676ebc5c8034/estudios_caso_control_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93df286-a89e-454a-bc4a-a267ed11755d/wubonojad.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 5064 bytes
SHA-256: b282e38e1830a531e5662a35c89f1b6ca005fe78c5d27970100ddec41d515b67
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10988 bytes
SHA-256: b69fb93d6485c0f59afcc656b7bd98e8101c4fe8b7e1968dd6891c8052124a36

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