Malicious PDF — malware analysis report

Static analysis result for SHA-256 0398902c20f2cbf5…

MALICIOUS

PDF

86.0 KB Created: 2021-05-25 16:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: acda431ac5899c9beb5f2b65b8f60b83 SHA-1: 265cc79c31c5170eb4ee901a402950e6cdf4df6b SHA-256: 0398902c20f2cbf57135882eb111520db815078a05beaa63e9d57a6e92712147
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=failure+mode+effect+and+criticality+analysis+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449602/normal_60190941103dc.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/nigewivubep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366952/normal_6000db7ce75b0.pdfIn PDF document text
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/55fab27d99.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/f6a564e2a7.pdfIn PDF document text
    • https://pelabinal.weebly.com/uploads/1/3/1/3/131379552/6268074.pdfIn PDF document text
    • https://vobiromab.weebly.com/uploads/1/3/4/6/134653190/dobidowexam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_605a0b0bb9f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_6044a00a4ea09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_60599a7393912.pdfIn PDF document text
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/ebddb5427f114fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5febeccc1d19d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5ffc4d4a298bf.pdfIn PDF document text
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/mewoxalidaxubaluz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fce3229dc220.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/c959c23f0e6d8.pdfIn PDF document text
    • https://gipavenox.weebly.com/uploads/1/3/5/9/135966662/gotezatuvet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/705bf50f-738f-4661-b2b6-5b468acc3201/johnny_cash_feat._u2-_the_wanderer_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/wajinobinewejilimibek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef64e3f3-a8c4-4f6b-8750-ae585d64a7b6/xikix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9516c09d-e0d2-45df-82a2-f9c944584f7c/buvefowowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd49b20-bc4f-4508-ae4e-41f27efe5d88/trane_xb80_control_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cca4331-0b61-4512-8591-39cd45cb401d/the_crown_epilogue_kiera_cass.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/jeziwetotofoborilodaxas.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/43744597191.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 5108 bytes
SHA-256: c5209aac59331a4b94d6a127a3bb06be5646dbedcfc4f04f18c3f5202c2c2e75
font_01_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 11504 bytes
SHA-256: 96ebffcf39fb3d965c21ca215f773d69b1a4559eb04992fabb10f04268495228
font_02_sfnt_off00013c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C00 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f