Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7b094848d0b942…

MALICIOUS

PDF

99.9 KB Created: 2021-05-28 08:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 14993a6c78aefb0595cafdf9ccea05d4 SHA-1: e817dfa57819b498fb9d696e8e66c4933ec957ca SHA-256: 5b7b094848d0b9424bdd8a00f5250dae82878a991f8cbae51899b2aac2cf1d4d
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of outbound links designed to potentially lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=anatomia+de+los+animales+domesticos+pdf+tomo+1 PDF link annotation
    • https://kazedodaregiz.weebly.com/uploads/1/3/4/3/134368633/96618abd2.pdfIn PDF document text
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/5a7d45b8ab3d.pdfIn PDF document text
    • https://mowewudogib.weebly.com/uploads/1/3/5/3/135310369/6923754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_6034dc360bed1.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/9207126.pdfIn PDF document text
    • https://fejomuzuzozasas.weebly.com/uploads/1/3/4/7/134748710/kikider.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_60523ceb374e0.pdfIn PDF document text
    • https://xuwojuzo.weebly.com/uploads/1/3/4/4/134471705/kiwob-jobusufusesek-fosefivovoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ffcf4f2e0518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_601306232ec77.pdfIn PDF document text
    • https://vokafevevuw.weebly.com/uploads/1/3/4/3/134320681/baxeborijolop_jalusulaj.pdfIn PDF document text
    • https://nosodawef.weebly.com/uploads/1/3/4/6/134693330/e4140ef21a5a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_6035ba4719a6f.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/97613d.pdfIn PDF document text
    • https://vagajexaxe.weebly.com/uploads/1/3/4/3/134359414/bizuzujeramisa.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/letidajemobala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419205/normal_5fed677224dd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_600eb448f1ee1.pdfIn PDF document text
    • https://xixotileko.weebly.com/uploads/1/3/4/0/134018517/1fafb4.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/1272975.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/fe61054c-908a-4f29-8f98-be4bda41a3f2/94240018382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec07e37-1bba-4559-9b2d-591af2599e8c/mamiya_rb67_pro_s_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf18dff2-5b9d-46b6-8096-025cae1f5cb0/iso_9001_internal_audit_training_online.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_off00014b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7B 5244 bytes
SHA-256: c73879cf3ab875db4d77888f90b7fb91ece04578661b17b2586669ba7f1c4072
font_01_sfnt_off00015d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4B 10696 bytes
SHA-256: 801b574351af98d9c1765d82b2bd2c5b5ef4e6e956516be129f2c4a8558232bc