Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79bd2321b796d0d…

MALICIOUS

PDF

72.7 KB Created: 2021-06-03 15:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7351cb45aba11f780f291786eb8d85b5 SHA-1: 293f6ce444aa899d3ff5ced707fe23a5b0890240 SHA-256: b79bd2321b796d0dc558cea19ca6585302fe23377f4572ff1e8881643c2085e4
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting. This behavior, combined with ClamAV detection and ML classification flagging the PDF as malicious, strongly suggests a phishing or SEO manipulation scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://archism.ru/pbw?utm_term=how+long+does+the+dyson+v11+battery+last PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450428/normal_603800c704449.pdfIn PDF document text
    • https://jutasosunefobe.weebly.com/uploads/1/3/4/0/134012390/digowo-gesaworaxafet-gulirifuxi-mafagutaxaxax.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366957/normal_60b600d5c9eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_60307e590fe63.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4479933/normal_60b793cf507a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5fe82563a98c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6013bbac6940b.pdfIn PDF document text
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/wikimimezuxulisuz.pdfIn PDF document text
    • https://defonufagij.weebly.com/uploads/1/3/4/3/134360363/pubegiziludeb.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/wimenaxeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funinupun.pbworks.com/f/93178675896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7534d0f-7ca6-4d8b-b74c-5534f09dec03/englander_pellet_stove_control_board_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec2cb49-abcd-4e8a-8a6c-e0445a6d4272/code_name_verity_book_age_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8f6b7f-5e00-4180-8e57-7dc8fe1c97f2/10_steps_to_successful_breastfeeding_poster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc67df21-4dc7-4cce-b59b-25b7f6e903e4/how_to_set_a_casio_wave_ceptor_watch_4723.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/f/valenotokuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08243dff-646d-4d1d-9559-4c4e27f17465/99799367258.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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 5496 bytes
SHA-256: 130de4bbd7a8fafc5b4a44e8d6d5165dc15470b7f8f41009ef53dda6f64b9341
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10188 bytes
SHA-256: 0f50a7f719bd909185d3b15087e261846a34dc2a62da34b9a17b498f70ab01c3

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