Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e74d0718057cec…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 09:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f0b35ef0d0d477ba357ad2c4335badc2 SHA-1: 9a1086d9145a88c918c17f9889241450c178183e SHA-256: f3e74d0718057cec03cef3fd9ad267479c40552be8df41af38a8f89913efbb4a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://lozipotod.ru/award?keyword=addition+and+subtraction+worksheets+4th+grade+pdf PDF link annotation
    • https://cdn.sqhk.co/lilaxikixo/fjeLjey/42474030146.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/33745910100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd666296fd1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_603bef0f3686b.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/jhcgcYE/tepiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470835/normal_60084335574f6.pdfIn PDF document text
    • https://cdn.sqhk.co/takabalal/jesCx99/call_of_duty_mobile_download_android_uptodown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5fe19731176d3.pdfIn PDF document text
    • https://cdn.sqhk.co/livoluxuwad/TiasFie/semulolibabivokiwiz.pdfIn PDF document text
    • https://cdn.sqhk.co/megilujij/jbigMhe/43620555426.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/RijjdKY/7094752562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_601a38bfe51bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5fc7729594a69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367283/normal_5fce4c0fa4bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_60206b502667b.pdfIn PDF document text
    • http://kakorezikudu.mypressonline.com/pharmacy_technician_resume.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
    • http://rogomore.myartsonline.com/5306836962.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/how_to_recover_dahua_dvr_password.pdfIn PDF document text
    • http://jowosos.myartsonline.com/16996080677.pdfIn PDF document text
    • http://famomijis.onlinewebshop.net/slipped_disc_exercises.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_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 5640 bytes
SHA-256: 3995264e5c87e1e4fdb54a7ac2d7e8e7db5b0206a646227592fc4730b9267c82
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10472 bytes
SHA-256: 952eeeab8e3d852fbb0a36f9ebff5f5ab8cce894d4dab392043d74ba6609c320
font_02_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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