Malicious PDF — malware analysis report

Static analysis result for SHA-256 7766cbc4ff1e7612…

MALICIOUS

PDF

82.7 KB Created: 2020-11-27 05:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2fe72b1ca44896361488a3201a6f081f SHA-1: 97152b7a2a48fa0b419df056fd38f7158bae790f SHA-256: 7766cbc4ff1e7612c1ebf0f6a955f1b925e1cc6b0bc1367ed0045493abf8daf5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://traffset.ru/strik?utm_term=the+4+hour+work+week+pdf+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5fadd423cc3b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5fbc1481f10b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_5fad13d505580.pdfIn PDF document text
    • https://dagojamigim.weebly.com/uploads/1/3/4/7/134763314/noxiwoboxoxiwufa.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/14b984dc3e735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_5fbf4dbda5a22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5fc052151f080.pdfIn PDF document text
    • https://pepazabam.weebly.com/uploads/1/3/4/6/134625160/nugefiz.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/rifomusodubufinoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_5fb3ed246a5b9.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/6777264.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff260a1-06f5-4e3b-8d82-825c83a8889f/pusesuxatagu.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/english_grammar_checker_ginger.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_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 5544 bytes
SHA-256: da3fe3c456f35d95602d22d8c86d1d2e76f5c3c7b522858d126447e26cccffbf
font_01_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 11192 bytes
SHA-256: 06f348ed26453157b92240ee9310c46f7913974cc3583580223ca9a9fe1d9f74