Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a46309a6e7b4b6…

MALICIOUS

PDF

70.3 KB Created: 2021-06-04 21:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 53d303f8a8b694700ce583dc05f7563f SHA-1: 22a813a2a401e155d1fe0c1ba0befcfb4bb0582b SHA-256: f7a46309a6e7b4b6f806ba7640524bd52e6fae2402a7c425727b3fca7e1bcac2
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious websites or download further payloads. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

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://ketchas.ru/pbw?utm_term=pirates+of+the+caribbean+piano+sheet+music PDF link annotation
    • https://woliremokeg.weebly.com/uploads/1/3/4/3/134340334/1077672.pdfIn PDF document text
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/4844919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_6030590ba2e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_60625de72e0b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_5ffabea6270b7.pdfIn PDF document text
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/2941158.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/witonixuloserikilad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fecef4e73eeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_5ff9b22b6cf4d.pdfIn PDF document text
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/497a8db.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/6361028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_6054747ae4f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_603995169a22f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_6016bdb4158db.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/40291.pdfIn PDF document text
    • https://ledatomonuv.weebly.com/uploads/1/3/4/6/134686063/e160088d3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_6056e7ce12f9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144562188/3971921103.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144579165/notodufenugop.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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 5364 bytes
SHA-256: 6d1e0e6c20bb11cd282fe7f3ba13ac0aa2f0dff69a072f91c5e0942171808424
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 11120 bytes
SHA-256: d367973471960490ab100261ff342096e48479b7d02c50ec58a119ec2299730a

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