Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7d6740052e76ac…

MALICIOUS

PDF

97.8 KB Created: 2021-05-20 08:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 257c1817f0255c539fe0ebd767cfd6fe SHA-1: 7d4f6b38abfa9d4675a2673ac8e1d477a1a6a9a6 SHA-256: 1f7d6740052e76aca862e17a59d7d96479bfaafea7e9800a3bd2cc955b89f058
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable domains, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lure users to external sites for further exploitation.

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://midufefew.ru/strik?utm_term=what+size+crate+for+german+shorthaired+pointer+puppy PDF link annotation
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/6727488.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/luwepefevuw_xonome_xagigulorelidaz.pdfIn PDF document text
    • https://molejurat.weebly.com/uploads/1/3/0/9/130969116/2646587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_60367eb1b4836.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/vuponalafa-joxaropi-gofubig-wixenoronufedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458829/normal_5fcb22bc983cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501041/normal_600245b9596ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_5fea1e3a88b3d.pdfIn PDF document text
    • https://bugajexovul.weebly.com/uploads/1/3/3/9/133997498/fumudu.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/44078947-8f1f-4017-8cc7-cd2ebf520d63/54306258619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ddea32-f7ce-47e8-8d2c-691331c964d1/28672516754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fd042d-61f4-432c-b498-800b0beeb4fe/1067224685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237e20db-a4aa-4edc-91ea-e4455c0300bd/poxopezoseja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6524e2-0b52-4b1f-aafc-ec9a1774d9ac/par_quoi_remplacer_le_beurre_de_cacao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b528fe6b-42c8-4890-91b7-a8243395fe44/bmw_navigator_vi_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7bc8e8-fa72-4f43-a907-cf5534b25f27/what_is_a_pleaser_personality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa135f2-be15-4edf-900e-0c65e44f9419/ghost_boy_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e1bf90-16ab-47e4-ae9d-4fe49875fb0a/jakak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feef43f0-d756-4afc-8ac7-049abec9dab8/nizimamanavob.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_off00013e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 5704 bytes
SHA-256: ca4f0c36c1a93a8bfa6e1536b9ffab7a3e36d7b01ccd06fa694e37cd707c54bf
font_01_sfnt_off000151ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EE 11744 bytes
SHA-256: 52796bca5e118b223ea5c95355bff10050db9768bb667186ba6ebda0f9ecaf04