Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78f3344a89c891d…

MALICIOUS

PDF

66.7 KB Created: 2021-06-03 06:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fa86bc41c94662d36c4aa57890c71f72 SHA-1: 1606c6ae7c69e27bb45418308e686dc3da89f965 SHA-256: b78f3344a89c891d6bb8f410397820b74397550e535360bae6a4f1f4a231e20a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to potentially malicious sites, likely as part of a phishing or content-serving scheme.

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://gimoguvi.ru/123?utm_term=brady+labelmark+6+software PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464532/normal_603cf520cf967.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/xevisigopij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_60633299aae5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_601a47ca25dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_60498da1c63a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_605df8bcd0acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_600ba978f216a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_605678ef38894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_602a349d24787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_600a1621810df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_603ec09d37316.pdfIn PDF document text
    • https://netodidomaxamoz.weebly.com/uploads/1/3/4/3/134311991/3acc5fed0809f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_602825685b2af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_606a804a113ce.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4497358/normal_60b132e4bb867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6012daebb35ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fcd53b99f90d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_6020fb94662b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144503187/watch_bollywood_movies_online_free_hd_quality_without_downloading.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/bwv_1007_allemande_guitar.pdfIn PDF document text
    • http://natizasex.pbworks.com/f/golf_buddy_voice_2_charging_instructions.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_off0000c5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DF 5656 bytes
SHA-256: e27dc78c791546fb78d9b2c15badd78a42d28f6a7f2bf890fcc435afdb8f8a73
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 10748 bytes
SHA-256: fe268612079c3e0356594d13ffa644269e61653a86381c26dc8761619563f572