Malicious PDF — malware analysis report

Static analysis result for SHA-256 43664d44982e67ab…

MALICIOUS

PDF

76.3 KB Created: 2021-02-10 17:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1f5e1870cf523c3b3d8a064a138d122b SHA-1: 99c440d361a922c2caeb6be2e112cac22fe8d8eb SHA-256: 43664d44982e67ab2ee41ca7160b2f027664de4be7b22a00445fb070d6f14b3f
166 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 hosting, and is flagged as a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/123?utm_term=3+g+for+free+ringtones PDF link annotation
    • https://cdn.sqhk.co/nebafori/cibgguW/music_without_lyrics_on_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/6Yt0yT7/silicon_valley_humane_society_spay.pdfIn PDF document text
    • http://vijufik.iblogger.org/ata_chapters_aircraft.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/gfxgdie/74054960566.pdfIn PDF document text
    • http://jibitivi.66ghz.com/thinking_skills_worksheets_for_grade_1.pdfIn PDF document text
    • http://tehnotop.store/bookboon_mathematics25ncz.pdfIn PDF document text
    • http://intereriia.com/vodiwuvigisid8cxyn.pdfIn PDF document text
    • http://itasummer.fun/40736659357a60ox.pdfIn PDF document text
    • http://it50life.pro/23072689794n3cjv.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/jih3wjf/ejen_ali_emergency_mod_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/mareduviger/cig6RWN/get_followers_on_twitter_free_fast.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/eihegd5/65792402206.pdfIn PDF document text
    • http://usblighter24.site/adeptus_custodes_codexsmc4s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nezenomawaza.epizy.com/26777413112.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/drivers_license_test_questions_and_answers_free.pdfIn PDF document text
    • http://sexoziko.epizy.com/98635072925.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_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 4764 bytes
SHA-256: 957ae54fb4e42c5970de0c1cc1b0112f954bd4aad268936cc76aa4f8b62c6173
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 10208 bytes
SHA-256: bc8088a05b4694605efa62287936a4f3535da12da625b5280ee77798935f0342

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