Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82b750b760d144b…

MALICIOUS

PDF

72.1 KB Created: 2021-03-28 12:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 532b29d26b1161db06131da221b2e121 SHA-1: bf7306e8f42807c655d7ed891f2bfb1ebc8c4680 SHA-256: b82b750b760d144b999011e3c9c50c7e52eef487128a1d3729df6251c51d48c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains a large number of external links, many of which are related to book titles or keywords, suggesting it is part of a link farm or SEO manipulation scheme. ClamAV and ML classifiers have identified this file as malicious, specifically as a phishing or trojan variant. The primary goal appears to be directing users to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=antimanual+de+filosof%25C3%25ADa+michel+onfray+pdf PDF link annotation
    • https://cdn.sqhk.co/kapokosop/Zjogcii/offline_games_to_play_for_free.pdfIn PDF document text
    • https://migomazi.weebly.com/uploads/1/3/1/4/131407029/3708794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_603d62b5539f4.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/cXUjfcO/cross_stitch_world_free_pattern_codes_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475565/normal_6000aa4c41d5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fcd75426dd89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_6036e0caa5bfc.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/ick6Xzx/75945284366.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/fjaRifw/17140035739.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/aWijD5B/baloledug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_605548b8757dd.pdfIn PDF document text
    • https://miregunuvarur.weebly.com/uploads/1/3/3/9/133997549/dulamigo-virunulus-jegelajuxikepup-jerekog.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/98f84cae-4da0-41d3-ae31-996522aeb3b8/73578037857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fac83e7-61d2-496f-a7ed-60a3e156f80e/how_many_plays_sonnets_and_poems_did_shakespeare_write_in_his_lifetime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b3ecf2-9758-4a3d-9e92-c8d08d1ecba9/somewhere_over_the_rainbow_free_sheet_music_voice_and_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10de1ebf-f8bd-477e-a8b7-6a3bf233927c/what_is_the_significance_of_teeth_falling_out_in_dreams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6b8be7-896b-48cb-b007-9f9f47d29b8a/28050737045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf874b3c-ecff-488e-8cd4-7e302c6e9bfe/saxolunasavijiwija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0619931a-0578-4283-afe5-2fec05883aa2/61857728147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496b0f4e-6cf0-49b7-af1c-20e00d3f5b8c/what_is_the_theme_of_a_harry_potter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72da6844-afd0-4975-b17f-7d4f135410de/pokemon_adventures_ruby_and_sapphire_manga_online.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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 5540 bytes
SHA-256: e62cc9e5bbd46e81d0c96f88d8e8ecd03f8f1f2a97ec868df9008214f9d3807c
font_01_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 11668 bytes
SHA-256: c53fcae7f1d023ca1538e8c825924cacd64c3c2533fa47e2a69536e53e65c283