Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9696fabe336c658…

MALICIOUS

PDF

74.1 KB Created: 2021-04-28 06:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4eb556a71460c18fbe99f5bbc22d6a5d SHA-1: 26724b0c0cea59d0f0a3d7559451fd6a4e8a24bd SHA-256: f9696fabe336c65832a57b2e08920e2552135726247642a4c7900425fb758ed5
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 or redirection scheme. The embedded content, though garbled, appears to be related to academic material, which is a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=fundamentals+of+microelectronics+behzad+razavi+2nd+edition+solution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422645/normal_6062409eb074b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_60637d155edb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_601af267843fa.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/2785aab8b2ba44b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_602c9b42e3ac5.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/fCpjdjd/33248924515.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/HYhhPhc/11972707853.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/epj0y5V/55400505318.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_60071af83b8c5.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/6ccd6.pdfIn PDF document text
    • https://jinepesel.weebly.com/uploads/1/3/5/3/135346763/4441985.pdfIn PDF document text
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/juvolajipakar.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/587991.pdfIn PDF document text
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/9b6fe89819.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/Dgft7hf/zombie_frontier_3_sniper_fps_mod_apk_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fe7f472761f1.pdfIn PDF document text
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/sojitivazixumot_setaresis.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/bff3bd9.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/8521327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_603a22a6d9747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fd0912898d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_6052a8836adc7.pdfIn PDF document text
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/mosiwu.pdfIn PDF document text
    • https://fopulowaledini.weebly.com/uploads/1/3/1/6/131637921/fejunuzurive_wugowafu.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/1242705.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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 5596 bytes
SHA-256: df9b0257c610f5993443c15fa76f70c16553dccaf1755ea2f77fa22c00f562cb
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10368 bytes
SHA-256: 2b727972918d1b22b506648c1c87cbec8d73207142920f0917d8edd0119199e4