Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba8f96ab0b7bb5b…

MALICIOUS

PDF

67.3 KB Created: 2021-03-16 00:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f9640f3d1b1f98986f8b12145dfeed33 SHA-1: 39c11e6b0b94fa040f41e0f592e50b727d7eedb5 SHA-256: aba8f96ab0b7bb5b036e551680e0b02013a06d52d2aa827f8441c40f60857812
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=ibm+enterprise+cobol+manuals PDF link annotation
    • https://cdn.sqhk.co/supekolev/hjThacI/felegoregovikitugalawege.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/igMFgjr/rocketman_watch_free_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5feaecd39ab18.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/75983979975.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/jf6Cwhi/101_okey_internetsiz_hile_apk_indir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_603637338ba3d.pdfIn PDF document text
    • http://chistohome.moscow/905454668lmd89.pdfIn PDF document text
    • http://teksol.xyz/doom_book_wiki6u7mr.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/bhexqFR/five_nights_at_freddy_s_toys_walmart_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478961/normal_5feb8a8107932.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/ckOhgrS/chale_aana_4k_hd_video_song.pdfIn PDF document text
    • http://socialwave.me/joxanenofiwv95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426060/normal_5fd89a30a0653.pdfIn PDF document text
    • http://vofufime.mypressonline.com/pikenerasinavarepefa.pdfIn PDF document text
    • http://levantegroup.net/2012_chevy_impala_ls_manual00cwn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30ee88c-1028-4bee-88c2-8e7431eb0d13/91361564173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c729d8a7-b01e-4f2e-9c44-d4679ad49971/casio_pathfinder_watches_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a2ff98-3f33-484f-a8ef-dd0ff77dbdf8/how_to_know_if_fuel_pump_relay_is_bad.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/lord_of_the_flies_important_quotes_chapter_1-3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d90445-1187-4bec-87fd-28c08ce8dd33/29105682855.pdfIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/translation_reflection_rotation_dilation_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 5156 bytes
SHA-256: a65407842f5a8ab191435f8ed3eb429b9aeda97a5cc6e93af4ba1a1649311a25
font_01_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 10544 bytes
SHA-256: 9422723e9e988d70acaebfc0b386319721f8146befe34f75bec2913c0c0fecb4