Malicious PDF — malware analysis report

Static analysis result for SHA-256 9374f328b744005c…

MALICIOUS

PDF

74.7 KB Created: 2021-03-12 21:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: df5b4d4737494a5f0de409e0a749c897 SHA-1: 86966e01a0e41dc32ff930751a87923b29158f15 SHA-256: 9374f328b744005cc49ae6a619f7293c8a41eaec23983ef9096ea7b41e88484b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector, likely leading to a second-stage payload or phishing page.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=big+ideas+simply+explained+ecology+pdf In PDF document text
    • https://cdn.sqhk.co/fokofike/9ynjg1H/cross_dj_free_dj_mixer_app_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/ihPhdqN/vertigo_medication_otc.pdfIn PDF document text
    • http://circulshtangcalip.website/ucl_dclinpsy_case_report_guidelines1ve2s.pdfIn PDF document text
    • http://dezlice.ru/around_the_world_in_80_days_2004_full_movie_online_free80o4d.pdfIn PDF document text
    • http://crubr.space/dupedonulemotigokaluzetadgyf2.pdfIn PDF document text
    • http://maturibcgj.space/synology_btrfs_slow_performance2yi2m.pdfIn PDF document text
    • http://tipografiyav.moscow/gulatuboxalatefpff0l.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/1ef7Chd/sukanodusezapo.pdfIn PDF document text
    • http://neyroskakalka.site/zilisojexiwumonikufizozyhl8r.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/xarenageliziba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28be8409-7f6a-47dd-9df7-616fac4fc658/ocr_a_level_chemistry_breadth_paper_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4732644-29ad-4e0e-9e43-1c89c772a686/blackmagic_intensity_pro_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c275ed8-f936-4e75-8875-2f655eca184b/neroxomolajozejufegiwiwem.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/hamilton_beach_oven_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae6c977-f286-4926-98cf-81c36d0309fc/pride_and_prejudice_full_movie_1995_episode_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99506e01-0189-46fe-97ab-b6fdd2b3bfd0/jexumuxuxivalerumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceca09aa-d652-4bd2-af84-a18351a2bee9/are_scroll_saw_blades_universal.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_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 5596 bytes
SHA-256: 74fb7b81445b1a7ba65109828dd14499b1ebd5f88104bf7143bc26f72c669ffb
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 12104 bytes
SHA-256: af277834aa71b23df59088b31c1d4bcd0b9d8101da27114fa3a2048a16b56ea0

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