Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ada9fe9f288648…

MALICIOUS

PDF

77.5 KB Created: 2021-05-16 21:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9097efc0b5b9419912bfeda29a59634f SHA-1: ecbe0b3ef6e59830ed02c89eb0c87d1f7e7e477a SHA-256: a5ada9fe9f28864802133692f986010abb93f462b4f5d25f069dfd567caae2d6
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 pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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://golowaki.ru/strik?utm_term=did+fredo+die+in+godfather+2 PDF link annotation
    • https://cdn.sqhk.co/sitopizol/iiGhdNd/diy_wood_projects_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/ccvEyRQ/bumomudexobubibakej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_600755b8664fb.pdfIn PDF document text
    • https://xumulevaz.weebly.com/uploads/1/3/5/3/135348617/4942746.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/Ngcijis/fleet_combat_training_center_atlantic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_60647bdf435c1.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuxilav/ghbhcbB/seinfeld_bubble_boy_full_cast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486537/normal_5fd03daa9be65.pdfIn PDF document text
    • https://cdn.sqhk.co/simumufij/mNAQ6eS/8216606134.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/zjdicji/real_boxing_2_creed_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_600e31d34e01e.pdfIn PDF document text
    • http://wusejopajaxus.22web.org/actuarial_mathematics_ebook.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/vigax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f55757-6e0a-4176-8366-b00226bab574/mizar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229c7719-b482-4b60-b5ae-9bc0bafa56f3/85238163740.pdfIn PDF document text
    • http://surenus.epizy.com/fasajumazuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c746b5b-00b1-4f0e-ad6b-ad37a3b80bd9/trig_functions_only_for_right_triangles.pdfIn PDF document text
    • http://repenebaroregom.rf.gd/pofofidafezogelebovom.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_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 5088 bytes
SHA-256: 134f47f61dcd5b61f2a60f3085350b1b60105c27e0b0ef34bf2724f41416445d
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 10764 bytes
SHA-256: db7b67dbf2fb503c74a86d89ccfcd8dc1861af02407ab2ee5c157bb111995392

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