Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5c6c470bb3af04…

MALICIOUS

PDF

88.7 KB Created: 2021-05-10 09:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bf1fc35ea37625bd438bdd6e64d3c22a SHA-1: bd272b7d923195db9446e93cceab8d7ac6682971 SHA-256: fa5c6c470bb3af047db17d6ed47c2ed4a1cd1b8eeddc71ed7568a90cade6790e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crophysi.ru/strik?utm_term=compulsory+heterosexuality+and+lesbian+existence+buy PDF link annotation
    • https://cdn.sqhk.co/rabuvimi/aotPoaN/alienware_keyboard_software.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/d16iaNR/hide_and_seek_auto_recovery_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/igZgfZj/my_cloud_wd_admin_login.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/ghjhD57/free_daily_maintenance_checklist_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/ijkhhhf/6368285470.pdfIn PDF document text
    • https://cdn.sqhk.co/gofejenizew/j2knaJp/luxuvegoxizaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/hejeihq/35529368813.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/22Qei1D/water_physics_simulation_hack_apk.pdfIn PDF document text
    • http://luzesawajipux.iblogger.org/xadegegovafokogunokipipow.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/70750364876.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/Umkgc77/marshalls_gift_card_work_at_tj_maxx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6011e6115fdaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_60603af20acf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_601a73f896006.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/sZQigjg/roman_tower_defense_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_605ca5cfb2188.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/jdzhdLh/killer_virus_game_android_free.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/fgjOhhS/7_little_words_game_also_called_othello.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/43093901846.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/88667215606.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/fodinizidesusaxowipegug.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/hhfu6YX/super_clone_game_mod.pdfIn PDF document text
    • http://mekapidi.medianewsonline.com/rudefevegasuxexate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_5fdc2c5dd7280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobovag.rf.gd/agenda_21_2020.pdfIn PDF document text
    • http://gomojilen.rf.gd/59884439529.pdfIn PDF document text
    • http://fijivenuzamiw.rf.gd/browser_speed_performance_comparison.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 5528 bytes
SHA-256: 7e8897fa642f301b9502ec71cf5701a4216ffa196dd8b551c6fe6232781975cb
font_01_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 11904 bytes
SHA-256: 9426ebbd06d9994292d1e55a7896997f34c44378b99422ddab4fcf4fe0b097a6
font_02_sfnt_off00013f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90