Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea8b16aca2a0a74…

MALICIOUS

PDF

71.9 KB Created: 2021-04-05 09:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 663b6c8964232d57a3f10f3034fbdd0d SHA-1: 511e29cb3833d38f5f52a7c970906644054b5d18 SHA-256: 1ea8b16aca2a0a744c93c64e62e7eb1583e76ff500d6842bc09dcfbfa0537d3a
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure. The presence of 'utm_term=the+micozzi+files' in one URL and the 'wkhtmltopdf' authoring application suggest a potential campaign targeting specific information or users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/strik?utm_term=the+micozzi+files
    • http://itawegan.fun/can_a_python_eat_a_babyuikpu.pdf
    • http://kuworekokinig.medianewsonline.com/tusamifesiwudawajejoxozi.pdf
    • http://kivolugog.mypressonline.com/86202651213.pdf
    • http://deutschebank-meine.com/10797336604ns17e.pdf
    • http://allrecipes.pro/jukileuh015.pdf
    • https://cdn.sqhk.co/vabedesi/hj62jbm/renting_agreements_templates.pdf
    • https://cdn.sqhk.co/xuwolupenilu/iZDFgin/hardtop_flexi_data_sheet.pdf
    • http://mosuxuvemuzuwex.mywebcommunity.org/aithihyamala_english.pdf
    • http://zasazigupat.getenjoyment.net/assistant_project_manager_job_description.pdf
    • https://cdn.sqhk.co/fafojipedul/pvQqhbu/music_player_with_lyrics_app.pdf
    • http://cardioactiveitalia.site/166858073pnayw.pdf
    • https://cdn.sqhk.co/lokutibu/jOTejdc/missing_persons_database_california.pdf
    • https://cdn-cms.f-static.net/uploads/4457311/normal_606055732eaac.pdf
    • https://static.s123-cdn-static.com/uploads/4463272/normal_6005fdccb3909.pdf
    • https://cdn-cms.f-static.net/uploads/4373517/normal_6035480a792f2.pdf
    • https://cdn.sqhk.co/xogudililavo/ZNhbghk/7254343852.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jikelofov.rf.gd/i_am_from_poem_template_in_spanish.pdf
    • http://guxasimedoki.epizy.com/31574652732.pdf
    • http://fasevebozumip.rf.gd/lomafe.pdf
    • https://uploads.strikinglycdn.com/files/c235137a-4898-4824-aba3-a5e330333e91/m-audio_keystation_88_program.pdf
    • https://uploads.strikinglycdn.com/files/3eec9040-3fae-43d9-9fb6-7e3f0fc02074/how_to_install_stanley_pocket_door_hardware.pdf
    • https://uploads.strikinglycdn.com/files/e90074cd-611a-4337-812f-e160dfcfed29/brother_hl2170w_toner.pdf
    • http://xuwarojuvewibi.rf.gd/78584039467.pdf
    • http://gumizaxewa.atwebpages.com/jigulixuvapesobejuj.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_off0000db69.bin
f9a806e0644156b759c8116c3eb493f04dd652dd7b32711a820d4ca5e9d74787		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 4812 bytes
font_01_sfnt_off0000ebb6.bin
37e73adbc6f0823f0727fb52f2c98995dddddc761120ff88d1b48a18c301156f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 10940 bytes

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