Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2496044b28804e6…

MALICIOUS

PDF

71.1 KB Created: 2021-01-17 18:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 190009875349c19a7d401cca78fd861b SHA-1: 78ac1bf24e38d44bfd8f97bf29ef8ba7010b4925 SHA-256: b2496044b28804e66284d68902f609530113965b7b51861675edfeed720042a5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically referencing 'my boy emulator full version apk', suggesting a lure for software downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score further indicate malicious intent. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=my+boy+emulator+full+version+apk PDF link annotation
    • http://ziwegiwe.iblogger.org/lagu_batak_house_musik.pdfIn PDF document text
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/nowefemoraxa-sarubuta.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/7765582.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/fghhhQL/dining_near_me_with_outdoor_seating.pdfIn PDF document text
    • https://cdn.sqhk.co/bakavaxa/RU3tPJS/rock_music_playlist_best_rock_songs_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebegawiwa/8djcghP/aarp_games_daily_sudoku.pdfIn PDF document text
    • https://wenojuzak.weebly.com/uploads/1/3/4/2/134265903/belijavarofozolaj.pdfIn PDF document text
    • https://site-1178749.mozfiles.com/files/1178749/rental_agreement_letter.pdfIn PDF document text
    • https://site-1173336.mozfiles.com/files/1173336/real_offroad_simulator_3d_2020_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/4241404892.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/irwin_door_lock_installation_kit_for_wooden_doors.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_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 5416 bytes
SHA-256: 30e538cff3c1a05879bed3700d6cd66ae6131a530f5ae7f360a453d863e3108b
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 11272 bytes
SHA-256: 9a606ca74191bf57f8058ab80f62ae32a473c406a89f93ba2534fc1cd2a4ea2c

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