Malicious PDF — malware analysis report

Static analysis result for SHA-256 561305443211fb95…

MALICIOUS

PDF

69.6 KB Created: 2021-02-13 14:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: be76cb01763f46913fd2cf1006bc9aea SHA-1: b45b43d04ca2941d87b0a1f23cbd1b47e0f3bfaf SHA-256: 561305443211fb9528a9c132f1cf023dfa24ec793daea9c2f8dbf6dbb066b62e
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for distributing further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9689

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 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
  • 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://baarspo.ru/aws?utm_term=tablayout+android+material+design PDF link annotation
    • http://aycotoro7.xyz/vanigofigamide0vjq.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/xggic5f/54326828649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_60248799bc287.pdfIn PDF document text
    • https://kewisivi.weebly.com/uploads/1/3/2/6/132681156/6051aa95f8fe74c.pdfIn PDF document text
    • http://circulyarkadigital.xyz/paruzipelodipilovutibatouyj73.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/MibCJ3G/ahl_teams_moving_rumors.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492586/normal_5fcabb72d9f93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_6003648b0f322.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/gRBPVhf/71062483603.pdfIn PDF document text
    • http://sweetmeet.online/download_terjemah_kitab_minhajul_muslimyprtl.pdfIn PDF document text
    • http://itravelimpressions.com/courts_singapore_annual_report_2017sc6xx.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hhih0t0/zevogekapezebodapaniti.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/banula/13473790422.pdfIn 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_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 2992 bytes
SHA-256: 90b4786343fb6b3437d01ece74735135c811139ed0f407bc2c4243ab4420ee43
font_01_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 5336 bytes
SHA-256: c23d17351a852ac25fa2cf6a52317bc6a07d1aa64a52b7403dde0aa2aedce698