Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac59db547e4da98…

MALICIOUS

PDF

82.5 KB Created: 2021-03-12 07:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 577500be7c55cb0c662815b0b2545424 SHA-1: 25df0160d2da3f4cfa28e69d6267dd6d85f166c3 SHA-256: 4ac59db547e4da98cbd21f3ff9b2880642313f166f6b6cee557724593af9f00c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'https://maypoin.ru/award?keyword=beta%25C3%25ADna+cloridrato+pdf', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful 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/award?keyword=beta%25C3%25ADna+cloridrato+pdf
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/3995198.pdf
    • http://zumewidife.mygamesonline.org/mens_health_workout_routines.pdf
    • https://mitosimizede.weebly.com/uploads/1/3/4/3/134372473/runifen-bujen-xumedovixi-kowasewure.pdf
    • http://pibarulajido.getenjoyment.net/64169957043.pdf
    • https://cdn.sqhk.co/vobevufubito/ibjjIzI/wogaxozexujegosodared.pdf
    • http://wifunagidoli.mypressonline.com/58623995433.pdf
    • https://cdn.sqhk.co/zubejavaxuvu/EWvgghj/virtual_sim_story_dream_life_general_quests.pdf
    • http://lezeninimi.medianewsonline.com/ethical_hacking_training_institute.pdf
    • http://resipowepo.getenjoyment.net/86898726009.pdf
    • https://cdn.sqhk.co/tajudozizif/ehdlfsG/romirijuxiwowujed.pdf
    • http://rexonina.medianewsonline.com/mary_poppins_cast_2019_imdb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sukokovevaz.atwebpages.com/35157030846.pdf
    • https://s3.amazonaws.com/desekusoxi/zupoxafo.pdf
    • https://uploads.strikinglycdn.com/files/15bf2672-f203-4807-8d5b-ee1cf5930cb9/craftsman_dys_4500_deck_parts.pdf
    • https://uploads.strikinglycdn.com/files/a18205a7-8c97-45dd-a5fc-2f4e0768ab5d/rascal_pioneer_mobility_scooter_manual.pdf
    • https://uploads.strikinglycdn.com/files/a78ea969-bb45-4930-a194-6f678b365aab/xowezajamepekajo.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/airpods_connectivity_issues_with_android.pdf
    • https://s3.amazonaws.com/jufowokedunod/fesezazajoxiji.pdf
    • http://pezefaxovojole.atwebpages.com/math_logic_puzzles_for_middle_school.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f929.bin
84f3e88f3b0296475e988bf0e09d333ca4236c960c4cf9dbc5aadef769a7ea2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 4864 bytes
font_01_sfnt_off000109b4.bin
e16b1d1671123a501e11bccaf01a098b57326966cb4adb65e83666d0e11f0e89
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 10260 bytes
font_02_sfnt_off00012cdc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDC 4324 bytes