Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41b0726c0e2c389…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 03:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5966b49732438b5e643938e6b44dd71 SHA-1: 8e0e5193b4f40e78bbf98f57591496b21c735003 SHA-256: b41b0726c0e2c38956afca46e3d3fedff7ea18bdf1730100e82316193666dcee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as 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 malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=diary+of+a+drug+fiend+and+other+works
    • http://summer-italy.fun/regogesikiwojoxoma56ufn.pdf
    • https://cdn.sqhk.co/pozazoji/KjbVvif/63402062196.pdf
    • http://termo-nord.tech/how_to_use_fragrance_oil_without_diffusert918l.pdf
    • http://tevfikyuce.xyz/how_to_write_a_navy_frocking_evaljct4r.pdf
    • https://cdn.sqhk.co/tefegegesuxe/giheQ8H/mit_graduate_school_application_requirements.pdf
    • http://bagadiwep.22web.org/smart_agriculture_technology.pdf
    • http://price-list.moscow/power_pressure_cooker_xl_beef_stew_recipesmhft9.pdf
    • http://blancer.xyz/how_to_find_velocity_of_a_dropped_balliea99.pdf
    • http://creditstar-kabinet.com/kinetico_water_softener_rebuild_kitn0s2i.pdf
    • http://grigolia-studio.ru/77572975522wcih3.pdf
    • http://yourcy.com/web_hosting_services_tutorialspointa9lnh.pdf
    • https://cdn.sqhk.co/dewufidabo/gfm8xif/57179752829.pdf
    • https://cdn.sqhk.co/nowonipewo/aLyhhrb/dash_till_puff_2_apk_descargar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_3861af86a711499f9c27b7d0ab495de1.pdf?index=true
    • http://wijobave.epizy.com/xasivaj.pdf
    • http://tizesabukabel.rf.gd/larixorero.pdf
    • http://riveminigokoxa.myartsonline.com/7469587047.pdf
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_1c08509c94bf46eeb0b5fc02a68faed4.pdf?index=true
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_81a3ff12b3ff4170b4a1fcdf96995783.pdf?index=true
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_72c183941e064e44adad4ba879e9549a.pdf?index=true
    • http://zubiluwetij.myartsonline.com/vasika.pdf
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_7571bd4b9d4248d2a46e5f7705fbc3e3.pdf?index=true
    • http://jimulopipuxofom.rf.gd/sigegevodobonokig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f701.bin
2552f44a33b7c9656ddf80f2b05931985b95ef16d378a6fbbeb564428b506719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 5396 bytes
font_01_sfnt_off00010978.bin
5007a84fee52bdadfb4de46f90cbe166eb92ae76642934fa3143f23872ffcdc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 11224 bytes

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