Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd39bf334d6fe489…

MALICIOUS

PDF

79.8 KB Created: 2021-06-05 16:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 24eb3f5d7b2cd3e6bd5cac86aefd3b79 SHA-1: 1016e61f9d63697e3508f6969fde6c61f301d142 SHA-256: bd39bf334d6fe4892ae2862f50ff80fab7a5c27686015c7ab91939fd842a0ed0
186 Risk Score

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 0.9990

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://mezovuduw.ru/123?utm_term=landmine+exercise+guide PDF link annotation
    • https://kizerovum.weebly.com/uploads/1/3/4/7/134747257/jisurur.pdfIn PDF document text
    • https://xojuliwujugiseb.weebly.com/uploads/1/3/4/3/134388488/11ccff6.pdfIn PDF document text
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/2689697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5fe493062f9ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_602a8ab9c341c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_6061fb09e4009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_601e543a8fca8.pdfIn PDF document text
    • https://bisimopax.weebly.com/uploads/1/3/0/8/130814127/6032736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420586/normal_5fe3f4f0088ff.pdfIn PDF document text
    • https://kogemopisita.weebly.com/uploads/1/3/0/7/130776015/1120082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495536/normal_60282d6723317.pdfIn PDF document text
    • https://tixamipoku.weebly.com/uploads/1/3/4/7/134740597/dazexijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_605b098cb7c89.pdfIn PDF document text
    • https://pisolani.weebly.com/uploads/1/3/4/6/134668870/3082193.pdfIn PDF document text
    • https://babulavired.weebly.com/uploads/1/3/0/7/130775389/2b3cb.pdfIn PDF document text
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/3554821.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370265/normal_60b01fd24dd04.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/225080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_605a47bac77fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0dee6547-2136-47de-97c4-b82261b17ebf/vimedujifuluvesod.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/f/todibebavemagaxetoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d15f28-9243-4a22-9b03-90f7c321cc9a/father_malachi_martin_hostage_to_the_devil.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144487629/subject_and_object_worksheet_ks2.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/zatezujasifujaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba4d669-f270-4e34-9a04-0deebac233ab/how_to_settle_personal_injury_claim_without_lawyer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 4928 bytes
SHA-256: 1276df97ea888383a14d3ec52885ec9cbaaff7e709d0c8498ab56cfa6d478d8a
font_01_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 10312 bytes
SHA-256: d476b3754051625d178a6a6499bd6c08ada0f05e0ebe4a9ec94da38c18acb5a9
font_02_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361