Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39233bd1eb02b0d…

MALICIOUS

PDF

71.5 KB Created: 2020-11-25 23:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7d4431dcfbc78927034a13cc1b9a86ef SHA-1: e8e0ce281800500dc3f3a2a803d5fa49bc741970 SHA-256: f39233bd1eb02b0d4a8811cbc24ae6eba271bdb8cad3e488ef0867210792b1c1
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, with one pointing to 'trafffi.ru', suggesting it's part of a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the document as a link farm on disposable hosting, likely designed to obscure the true destination or spread malicious links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/123?utm_term=circle+ten+council+fairview PDF link annotation
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/c64aa9a669.pdfIn PDF document text
    • https://dubozenerur.weebly.com/uploads/1/3/4/6/134687155/1960970.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/vidubudinajubibuzuw.pdfIn PDF document text
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/zirebitusawin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5f9cac90bcce4.pdfIn PDF document text
    • https://wegogutez.weebly.com/uploads/1/3/4/3/134310606/gajikewubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5fad10fe4a710.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/gogonof/70667724288.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/brandon_grotesque_office_free_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f88cac-83f9-4fce-9904-e7eb3a15c04e/disney_new_balance_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/11038533867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bff77e-fa76-4f7d-84fc-041e2448c802/business_data_networks_and_telecommu.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/ximabapumatodutapapoleb.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_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 4756 bytes
SHA-256: 7610cb64fbf41e762d21c0588908cc37379d09e2ccbf5ddb78f7cfb871962513
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10776 bytes
SHA-256: 91e0e33694af8e9e236b4901b6d874a2ac7e2fbe7cf166e94f1401bc6037bd25

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