Malicious PDF — malware analysis report

Static analysis result for SHA-256 85df04b0ed6deac7…

MALICIOUS

PDF

78.4 KB Created: 2021-05-30 21:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca32c53ff0d3720d741127c87405030d SHA-1: 0b860372f81adafff0944c451fbbf835340277a3 SHA-256: 85df04b0ed6deac7dbdb31aaae1298289d91c906f5e3ec7a5d8b058c3b47add8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The primary external URL observed is 'https://dugedepap.ru/strik?utm_term=disrupting+thinking+pdf', which likely serves as a landing page for a phishing or scam operation. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/strik?utm_term=disrupting+thinking+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fee7424a9d38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5ff348fd8d1b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414491/normal_5fc609c70ea3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60354e21dca8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_60570fb0aa517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_606e56c8d5ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_6063fe7415737.pdfIn PDF document text
    • https://xogepavawoda.weebly.com/uploads/1/3/0/7/130740110/2aea1173a75a7f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5ff9a72aba245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_5fccbe3c94d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_605fa06d487b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_6035355f68ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489713/normal_602c86917e452.pdfIn PDF document text
    • https://peniwomafases.weebly.com/uploads/1/3/4/7/134705361/8461029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_60538566c9529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_600d486a6e177.pdfIn PDF document text
    • https://suzibosefibowu.weebly.com/uploads/1/3/4/8/134883218/gofaneluwoxusana.pdfIn PDF document text
    • https://rogifegupoxixo.weebly.com/uploads/1/3/4/0/134040774/09497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_5fd11a495823c.pdfIn PDF document text
    • https://dirujewe.weebly.com/uploads/1/3/4/6/134677456/nasevete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_602941615f536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492272/normal_6023e16111f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_602ab8a4898e3.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
    • https://uploads.strikinglycdn.com/files/981c0885-c24a-4262-87e0-ca4a17d90a3a/big_buddy_heater_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbeb0d4f-e65f-4300-841f-879cc7fe1e4f/hp_laserjet_1536_ink_cartridge.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_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 4776 bytes
SHA-256: 329aa13ee2213d98d93fb24383f10af719614d907ab0edec78d1861729bbfad6
font_01_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 11024 bytes
SHA-256: 35bd99b0233ed38dbab71fa858eb5a33fc4a3e05997bd2baa9d5adb8affed634
font_02_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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