Malicious PDF — malware analysis report

Static analysis result for SHA-256 0921a974809b0bdb…

MALICIOUS

PDF

75.3 KB Created: 2021-03-21 09:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 483ee44fefce09cb1debf1b887750967 SHA-1: 070d69109fb863a5d2ac7da7e35f73933ca60b57 SHA-256: 0921a974809b0bdb3379547ee0baf7bc622b3394546de2a4a433df83c496325c
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to search terms for sheet music, indicating a deceptive pretext for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=beethoven+concerto+5+sheet+music+piano PDF link annotation
    • https://cdn.sqhk.co/rojarimeg/jhejdk1/warriors_of_fate_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/tOatjbA/kajejugowapezupajojad.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/capsaicina_beneficios.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/fihjdgc/62335397563.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/k4ggicd/gold_and_silver_prices_today_jm_bullion.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/4ijjijh/whatsapp_status_sinhala_love_video.pdfIn PDF document text
    • http://zipafaxelati.sportsontheweb.net/building_and_structural_surveying_n6_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/gewigerajoru/Kujc2Xk/java_create_instance_of_template_class.pdfIn PDF document text
    • http://sidazolomaw.22web.org/60605678949.pdfIn PDF document text
    • http://vumubolerik.iblogger.org/credit_card_authorization_form_hotel.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/4699782857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuteninuxad.rf.gd/legacy_of_ashes_review.pdfIn PDF document text
    • http://galiwasik.rf.gd/abcd_video_songs_hd.pdfIn PDF document text
    • http://dupumimegijema.epizy.com/acgih_tlv_2020.pdfIn PDF document text
    • http://xaduvegovoz.rf.gd/maggianos_reheat_instructions_lasagna.pdfIn PDF document text
    • http://doritiwenoxa.onlinewebshop.net/tomozip.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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 5372 bytes
SHA-256: 9366c8d373394bab58182ba0a27e026405ae5c59ea0bc8b491883413948c9081
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10896 bytes
SHA-256: a3d6d9c7a867500c1a984c3939c2644de15c6ed9f3ff2c9c2fbc5c6b0edc74dd

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