Malicious PDF — malware analysis report

Static analysis result for SHA-256 af383a41e7239172…

MALICIOUS

PDF

93.3 KB Created: 2021-02-15 18:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bba955d95aa6dcc1d8a20506c2ba9b58 SHA-1: ce867171f3b7397120da30616816fde89b2206ed SHA-256: af383a41e7239172133c230dbd9bf3f5154bc90b88ac2527feedd19fe2567712
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, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the overall structure point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=microsoft+cloud+background+check+reddit PDF link annotation
    • http://boevoenlp.com/stanley_garage_door_bottom_weather_seal_canada6cyb9.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/Jjcgigh/craigslist_maine_atvs_for_sale_by_owner.pdfIn PDF document text
    • http://afracheat6.xyz/download_game_grow_idle_archer_mod_apk_hackmvs5q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_600392b4ccd6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fda9546ae066.pdfIn PDF document text
    • http://rutonujak.iblogger.org/drama_beautiful_reborn_flower.pdfIn PDF document text
    • http://vykupavto54.ru/miss_universe_1994_question_and_answer6vqqu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5fe3e855b0856.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/0hgdZPj/kanto_power_collection_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/AgeImij/52349061507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484103/normal_5fc82ac4b6fdf.pdfIn PDF document text
    • http://fasufigige.iblogger.org/17573905299.pdfIn PDF document text
    • http://nokutanebufevon.iblogger.org/bengali_old_dj_song_pagalworld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakepusigazu.epizy.com/1998_buick_riviera_performance_parts.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/animation_movie_maker_free_full_version.pdfIn PDF document text
    • http://bikufupok.rf.gd/36708295941.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/94277364831.pdfIn PDF document text
    • http://dudulexo.epizy.com/calendar_format_in_excel_2013.pdfIn PDF document text
    • http://xoxiposewarewa.epizy.com/78914948348.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_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 5492 bytes
SHA-256: fc17278da973993ed8b7b443ea84baab45587b64def06e6a495d17d797f6e02a
font_01_sfnt_off000144ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CE 10184 bytes
SHA-256: db06930ffe581759f181d8784e45c6c8f090e4bed0bb07f5995c6240a1938e57

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