Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f04e3ed9125bad…

MALICIOUS

PDF

71.2 KB Created: 2021-01-23 00:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d16c996a993dc2769746edebaec40816 SHA-1: ec9c2cf3f00f5f48a6c17392f5b5d66961680b60 SHA-256: b0f04e3ed9125bad32a82012602cc3d5d6dc59d14482cb3fcd714b146a51d79e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites.

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://bologen.ru/123?utm_term=cheap+project+cars PDF link annotation
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/xepuvovikota_disivuzexaw_porabenalekep_ribovedipi.pdfIn PDF document text
    • https://mutokanapagoz.weebly.com/uploads/1/3/1/6/131606569/855008.pdfIn PDF document text
    • https://vixekilawuta.weebly.com/uploads/1/3/4/3/134305586/padedoselokaf.pdfIn PDF document text
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/437213.pdfIn PDF document text
    • https://site-1221887.mozfiles.com/files/1221887/nabepo.pdfIn PDF document text
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/631629.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/33e8d18249b7b93.pdfIn PDF document text
    • https://site-1184900.mozfiles.com/files/1184900/kikutudazuvaweg.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/9361914.pdfIn PDF document text
    • https://niromovikusuzu.weebly.com/uploads/1/3/4/6/134651616/foribut-memiwake-lozifapunuvew-levebovarok.pdfIn PDF document text
    • https://govasosu.weebly.com/uploads/1/3/4/5/134519533/3198570.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
    • http://wefazor.epizy.com/argentina_chile_copa_america_2015_formaciones.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/birthday_invitation_card_design_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/53670398718.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_off0000ce89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 4720 bytes
SHA-256: b26ff75f66252a66c117e51e2220bb66db013356e7c34f3b8775d9fd1d45bfee
font_01_sfnt_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 10308 bytes
SHA-256: b2e2c42b6e16930b4ed4d64aaa7c16ffbd75b3ec8441c3fa8281f9b8f2ae570f
font_02_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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