Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fba4ea66161a89d…

MALICIOUS

PDF

72.2 KB Created: 2021-06-05 01:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9604dd11cf03ac18c7ceb8f72fd90b1e SHA-1: e8272e3e171b7b8838074c91974ab954f61ab2bf SHA-256: 3fba4ea66161a89dec249b088f4c8cd63ac530c4eb3fb49119a3fcca51b2faee
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, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

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://pistant.ru/pbw?utm_term=free+download+wga+remover+for+windows+7 PDF link annotation
    • https://fizobadajavene.weebly.com/uploads/1/3/4/4/134492874/498f7994c725.pdfIn PDF document text
    • https://suzupiba.weebly.com/uploads/1/3/4/5/134507321/2243325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485810/normal_5fcedd09b8676.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/1b8eddf1a2226b8.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/dizalifuniw-wevusa-xixamer.pdfIn PDF document text
    • https://xozugovapotup.weebly.com/uploads/1/3/1/1/131164024/7a2cc3351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fd3821796b6a.pdfIn PDF document text
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/bakepobosukur.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/4d793ec5d.pdfIn PDF document text
    • https://webutukokixomuw.weebly.com/uploads/1/3/5/3/135317122/pumufevudubikuwas.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/wewozarakexigo_luxij.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/6480337.pdfIn PDF document text
    • https://dibufasefeduvit.weebly.com/uploads/1/3/5/9/135975636/9790010.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/7268294.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/wewasesopixu.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/7218767.pdfIn PDF document text
    • https://pafekirikigu.weebly.com/uploads/1/3/4/5/134590200/9168897.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 5412 bytes
SHA-256: 822f96b9dcd886368b06cdad577a5484de4ccc2134ecfba8218982b312b9a267
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10256 bytes
SHA-256: 622b38fd4a5f1247914e120273c195b9b0c3e15c7ca23a3824fa9eb403d928c0

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