Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f172d4f6cbffab2…

MALICIOUS

PDF

86.5 KB Created: 2021-04-04 18:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da6e336d4c2847a060683c4412b174a9 SHA-1: b2e9c79a0538e0e39f75ea55432eca6d82e0c111 SHA-256: 7f172d4f6cbffab2a0a9ed738995d73cda3d181e2ff4da6b1274509c4a1ba9de
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external websites, with one prominent URL being https://nipisod.ru/123?utm_term=factorio+guide+app. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The document body, though heavily obfuscated, contains references to 'Factorio guide app' and 'wkhtmltopdf', suggesting a lure to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=factorio+guide+app
    • http://tedusoxunola.22web.org/tatedofukapevage.pdf
    • https://cdn.sqhk.co/pixazizaze/6KMdgeE/29881751619.pdf
    • https://cdn.sqhk.co/vopokemib/jdhdBge/jewebil.pdf
    • https://cdn.sqhk.co/jumupebuvi/ijjx2Zv/proline_mic_stand_guitar_center.pdf
    • https://cdn.sqhk.co/wafifovuwel/Kicjdib/moon_event_hill_climb_racing_2.pdf
    • https://cdn.sqhk.co/pategazikiw/djagcgi/disney_2_movie_collection_dvd.pdf
    • http://vuvifel.iblogger.org/wednesday_night_in_downtown_atlanta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xarojapi/video_game_collection_spreadsheet.pdf
    • http://novademovu.rf.gd/besan_ki_barfi_video.pdf
    • http://debetofewozuri.epizy.com/chalanachitra_video_songs.pdf
    • https://s3.amazonaws.com/polojuliragam/sentry_safe_how_to_open_for_the_first_time.pdf
    • http://wulagaw.rf.gd/boomkin_pve_guide_3._3._5.pdf
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_71ce2c13f23741939d34ff3aed27fb4e.pdf?index=true
    • http://sukilik.epizy.com/52574009188.pdf
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_76f6e2251ece4485a4e7f89ab537c3e1.pdf?index=true
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_a3a9ca2cdcd64ac9811e5ab86c130e6b.pdf?index=true
    • https://s3.amazonaws.com/ninasivol/letter_from_birmingham_jail_text_analysis_worksheet_answers.pdf
    • http://gurunetotej.rf.gd/jexavokirovodofe.pdf
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_886074a9015944079cd27f2ec9507417.pdf?index=true
    • http://laganinol.rf.gd/58269412521.pdf
    • https://s3.amazonaws.com/gujutavevive/2301184053.pdf
    • http://zakamizorone.rf.gd/riesgos_de_trabajo_mexico.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_off00010d6c.bin
52f429a5f0d370d591686eaac9165bb3a4f1fca7a7fa576f78f2b7b4aff43708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 4988 bytes
font_01_sfnt_off00011e72.bin
5a9477e88ae69743cd391084abec8dc3e852d6980c4da89087ec68314cf7c41f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 14508 bytes

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