Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1d8a60b286c3e2…

MALICIOUS

PDF

73.8 KB Created: 2021-06-03 10:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1a93ef500759f4964b9a7840dab87dee SHA-1: 91c02aca366c18d663ff791ef31a895c3e83d2d4 SHA-256: ba1d8a60b286c3e23056c2b3ad70efcb9da64d1802d91aec6ec6e82ca513efa2
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm or phishing operation. The document's content is obfuscated, but the presence of numerous external links and a high ML classifier score indicate malicious intent. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports this assessment.

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://krisoc.ru/pbw?utm_term=how+much+does+a+great+dane+weigh+at+12+weeks PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5ff8b69bb6cb1.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/xetoti.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4378830/normal_60b3439538819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_60455693ec0e9.pdfIn PDF document text
    • https://bewotenugajuvu.weebly.com/uploads/1/3/2/6/132695730/41e9450a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499660/normal_6067cd6385d38.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/lafojidapaku_gadotoz_kobegalu_netixuxufonoru.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/8867135.pdfIn PDF document text
    • https://potemoguzoka.weebly.com/uploads/1/3/4/6/134646314/ragutajax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_6030d07a3d6e7.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/07ef285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fcacd8b4d765.pdfIn PDF document text
    • https://rilejaxetikisoj.weebly.com/uploads/1/3/4/3/134391290/warag_digarebepamamuz_gobevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_603fca9ccfbbc.pdfIn PDF document text
    • https://derejesi.weebly.com/uploads/1/3/4/3/134388634/61ea679cd.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/tigifalewazire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_6029b2468e582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_60406d649a324.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/dc960f61-c03a-4a8e-99da-fe7636bbaeec/41598776947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8059b408-a85a-4da3-994f-477401115e9d/24857797823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02cda473-f10d-4091-8bc5-7c6480019285/wopatubanejovu.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_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 5624 bytes
SHA-256: a47844a1fc1eb5c5e739b184204ced9aba4242f66bb8ff3737ba4c539998d1d0
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 10284 bytes
SHA-256: f9b5acb1715b36fe6ed25c54315369ce04fdeece6b364614a09b88739f97edc4