Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0bc0e5ce9a8ba1…

MALICIOUS

PDF

147.4 KB Created: 2021-03-22 03:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4b7a24c673d7b98479a8333270dbbcb6 SHA-1: 40484b6d211e871f47fa013cb946fa9f514b59dc SHA-256: 8d0bc0e5ce9a8ba16b278d2079b67ac94c1a5fc585312368060061b8ffc98829
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it links to known malicious redirector infrastructure. The embedded URLs, such as 'https://dafemum.ru/wix?keyword=...', are likely part of a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous links to potentially disposable hosting supports the phishing or redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://dafemum.ru/wix?keyword=%25D9%2582%25DB%258C%25D9%2585%25D8%25AA+%25D8%25B1%25D9%2588%25D8%25B2+%25D8%25A7%25D9%2586%25D9%2588%25D8%25A7%25D8%25B9+%25D8%25B1%25D8%25B3%25DB%258C%25D9%2588%25D8%25B1+%25D9%2581%25D9%2588%25D9%2584+%25D8%25A7%25DA%2586+%25D8%25AF%25DB%258C In PDF document text
    • http://zhenskiizhurnal.ru/91261689670bo1g4.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/T7ifbeg/stickman_rope_hero_mod_apk_download_free.pdfIn PDF document text
    • http://kpovli.ru/what_is_meant_by_the_fruit_of_the_poisonous_tree_doctrine_in_relation_to_searches_and_seizuresvxtpn.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/pibodewuwamat.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/4thbhgC/temple_run_game_download_uptodown.pdfIn PDF document text
    • http://kupivse.xyz/zogit7op2u.pdfIn PDF document text
    • http://qrettalq.online/who_makes_the_best_quality_refrigerator1bcmu.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/gdJWA4F/46510529659.pdfIn PDF document text
    • https://cdn.sqhk.co/fojufifef/bwie7EF/50503473454.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/aV5y9Gg/jodigufiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/hfPX5jh/10764816359.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/agdfhgc/3d_bowling_boss_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/m1ifpiI/xitibaki.pdfIn PDF document text
    • https://jurijibo.weebly.com/uploads/1/3/0/8/130874645/5185af16ae9b.pdfIn PDF document text
    • http://exampl1214.com/polaris_side_by_side_170_for_salenim19.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/dakebesuvum/ferrari_ff_used_buyers_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/descargar_adobe_photoshop_sketch_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/baxuwanunibame.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_7f2bfdf3783447b1b55a51cbf426a084.pdf?index=trueIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_c2745a0c522c41a6b7595307f39fdc4e.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_b00632a212c741b582cc86d6f7fe13f4.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_b3274e276df144508b988f0411f040e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/11600526232.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/40234680124.pdfIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_eb361d18a7674613b1f11892d112ef38.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0002035a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2035A 32048 bytes
SHA-256: 9aa8f841abb4ae7ea0b955f5b826ef1f4f6ce7be371a069ea89676a57d2be024
font_00_sfnt_off0001b74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B74B 4068 bytes
SHA-256: 9093d88ed2f51c078dd44114aa35e5641b1c3a839509d1d398fe9e3f8c83fed2
font_01_sfnt_off0001c52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C52A 9884 bytes
SHA-256: f379e8dd6e9bb9141900e02ae6b48d4527e4711b8f491306ce5ae1ec0ee19a51
font_02_sfnt_off0001e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E73A 18232 bytes
SHA-256: d67508555dbb4d62b9cae5b9e9be1e8cd518b9a23be185a60dbeabea2863f71d

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