Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b07804b337d1b5c…

MALICIOUS

PDF

75.8 KB Created: 2021-05-18 22:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7ba3697c9ad091cf7d789cea28211f58 SHA-1: b00f782795fb5bed73bd0518b4aa8a26fb4203dd SHA-256: 8b07804b337d1b5c5a6f44513cff5c1f2336720eee244deb907e41ff741d7dea
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of outbound links designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

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://vilenefex.ru/strik?utm_term=how+to+open+dyson+ball+vacuum PDF link annotation
    • https://vilotirupoj.weebly.com/uploads/1/3/5/3/135328316/dekef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415530/normal_60052e6dea79b.pdfIn PDF document text
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/puxuseronino_mejudefovunelo.pdfIn PDF document text
    • https://zirodamabesad.weebly.com/uploads/1/3/0/7/130740068/735476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5fdc459e6c03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fd909d290c20.pdfIn PDF document text
    • https://nimefoxigobaki.weebly.com/uploads/1/3/4/8/134847293/loxadibuwiduwis-donesatetideme-gapivojoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_6051b0ba8be88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_604218b4e3d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_6029990c48e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488103/normal_6049e5a4bca70.pdfIn PDF document text
    • https://vulefinan.weebly.com/uploads/1/3/2/6/132695887/7070398.pdfIn PDF document text
    • https://zovavofesaduj.weebly.com/uploads/1/3/4/7/134770402/1502080.pdfIn PDF document text
    • https://suridivulav.weebly.com/uploads/1/3/5/3/135312357/rariba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/all_html5_tags_must_have_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/anamika_full_movie.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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 5476 bytes
SHA-256: 5a8057715f3785b588c1c6be0bd31c60aa763ae01d6ca3a271b417fdf403e2d6
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 2712 bytes
SHA-256: 48a5f28bf5e94810be2460657f34b0b9a20a4ad423bb835fb4241d1c2f8f4d80
font_02_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 10816 bytes
SHA-256: fac5bafadee4ffdeae808bf6aa432152e357b20fb0d34b6da9c1811f14320edc

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