Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b91a92451b6c49e…

MALICIOUS

PDF

83.0 KB Created: 2021-02-17 15:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9fb3f37557d95753a65a497536a88afe SHA-1: 3bfb8f15db6665d8efa124d5e2c989ade968a389 SHA-256: 6b91a92451b6c49e0dd8748b383f2a3cdceb62916a7582bd1eb34d8a62be78e6
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one prominent example being https://jottigo.ru/strik?utm_term=i+heard+you+paint+houses+movie+cast, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=i+heard+you+paint+houses+movie+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410018/normal_6028f5b33ab5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_602c5324f330e.pdfIn PDF document text
    • http://robolab.one/school_of_dragons_monstrous_nightmare_on_firekk0b1.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/jgjaujb/mon_cash_digicel_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fcdcbe0034f4.pdfIn PDF document text
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/4c2d1588b6e.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/hjTPHau/69530661336.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/9985686.pdfIn PDF document text
    • https://cdn.sqhk.co/sivojadirabe/hi1S7gj/veduditawijuxajef.pdfIn PDF document text
    • https://muxojuwarerufi.weebly.com/uploads/1/3/5/3/135388895/mozufutubifun-bavogumap-fokodafuniwop.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/icnggge/90228993608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403541/normal_5ff2da1a35069.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/xifolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_601a55113f40d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://komopojanali.rf.gd/sotigubig.pdfIn PDF document text
    • http://zazujipediwa.rf.gd/84039461664.pdfIn PDF document text
    • http://vipowiso.epizy.com/italic_handwriting_worksheets.pdfIn PDF document text
    • http://zerekigukazaja.epizy.com/fannie_mae_guidelines_on_short_term_disability.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_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 5380 bytes
SHA-256: 7147c048617f4c34a4a8a1a801ff00fb8ca018d0597e104ebdcf9c042ea5c7b8
font_01_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 10780 bytes
SHA-256: 04b4c0c7322b239930c93f3b3d50f7b2b5c33153898c32edc0f76c819c2d9435

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