Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3496d351a5efe7…

MALICIOUS

PDF

83.5 KB Created: 2021-03-04 03:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 76acb65aea2ed5a3eb8af5bd8f20a83f SHA-1: 14c6095328c2428e4bbd3e02af1a24f62113f96d SHA-256: 6a3496d351a5efe771c627999f4e02a4df024b96862fb282b2e202d3f4623d8c
186 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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were extracted, the embedded URLs and the nature of the link farm suggest a potential distribution vector for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://pelibifir.ru/award?keyword=heat+and+mass+transfer+interview+questions+and+answers+pdf PDF link annotation
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/179650.pdfIn PDF document text
    • https://newafiramolik.weebly.com/uploads/1/3/1/0/131070062/jijisuvekolov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415930/normal_5fd1dfced9aaa.pdfIn PDF document text
    • https://movalolutipala.weebly.com/uploads/1/3/2/6/132681002/7793048.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/jcgcijG/penibevel.pdfIn PDF document text
    • https://penegekefifix.weebly.com/uploads/1/3/4/5/134586424/xodewi-xabodumitixo-bosakazifo-xurivimuxaw.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/7OjiibI/riwotipewozuwokam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fd386a0d1615.pdfIn PDF document text
    • https://vemakovuzabomon.weebly.com/uploads/1/3/4/8/134881214/b55373dd738aef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_60307956a6d3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401546/normal_5ffb7dc343ef3.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/SQgfhfD/5520694649.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/fja42jh/dining_room_light_fixtures_rustic.pdfIn PDF document text
    • https://cdn.sqhk.co/melivetipi/jsPriiT/rimozagatapururinepiv.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/sefiwegegagu/newasivaf.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/tubovifuzokubake.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/whatsapp_status_bollywood_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/80763128015.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_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 5396 bytes
SHA-256: 30fa3faee3a003dfdbf194590b4a33df5572cd76464a8aaa2144c25678724511
font_01_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 10192 bytes
SHA-256: ae277d47fed40af491e53963661890e17e473b55ffe7b66ca00bafd969b3e96d

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