Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bfa01953c7a5a0…

MALICIOUS

PDF

79.7 KB Created: 2021-03-28 21:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a85225724f884d9edae2d9cbee47c9 SHA-1: e5cf131f45eac23572045eb3054f3f140fd6ed75 SHA-256: 40bfa01953c7a5a0292d0e78ef101c0cf0f3e549dcf6e62d497ad1fb2cb1b129
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a heuristic indicating a link farm, and a detection for 'Pdf.Phishing.Trojan'. The presence of a 'download button' lure further suggests a phishing or malicious download attempt. The document's structure and the high number of external links point towards an attempt to manipulate search engine results or host a large number of malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=bankersadda+banking+awareness+capsule+pdf
    • https://cdn.sqhk.co/munuluxel/hcZobhj/xurakarenidaxadil.pdf
    • http://xemizawufogutuf.scienceontheweb.net/brihaspati_mantra_in_bengali.pdf
    • http://nopezimugabotik.mygamesonline.org/segurana_e_auditoria_em_sistemas_de_informao.pdf
    • https://cdn.sqhk.co/zelosoza/ab9952j/66047840111.pdf
    • https://cdn.sqhk.co/dewufidabo/eFCUFno/43393685541.pdf
    • http://wifunagidoli.mypressonline.com/waxumalipapajegolipujir.pdf
    • https://cdn.sqhk.co/mudonisogub/jeuibof/sheltered_synonym_meaning.pdf
    • http://luxibenuguk.getenjoyment.net/software_engineering_books_for_bsc_computer_science.pdf
    • https://cdn.sqhk.co/fejavegiwo/giL0jci/sim_racing_race_game.pdf
    • http://roselosudeve.sportsontheweb.net/82107884562.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/8f373b78-8686-4175-ad36-a7a86622bf72/tutudekixewuviluja.pdf
    • https://uploads.strikinglycdn.com/files/82fc7865-1e35-45ef-bf01-e141b4f94f56/zowoxezogetapuwesanazimu.pdf
    • http://sutexuvidag.myartsonline.com/is_online_raffles_illegal_in_philippines.pdf
    • https://uploads.strikinglycdn.com/files/8c9d290e-f86c-48ea-9ea5-56b557f6d91d/39616608583.pdf
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_623d19dc3df647edb7d99b834ab82fa6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b1098ae-580e-4136-90e1-160acca0b636/bowur.pdf
    • http://jugugesazo.myartsonline.com/fawiloda.pdf
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_65700a94c5af4771a3028c05918a0ec6.pdf?index=true
    • 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_off0000e40c.bin
fa3233215625873ae5e64a1f40472212732fcf240f1f5a960d0bad6feacac36d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 5668 bytes
font_01_sfnt_off0000f77b.bin
0891a07456dc79b8841e3020d6d0d378178a2aa0b502e3118592355288793a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 11012 bytes
font_02_sfnt_off00011c89.bin
03ef4a2fc0fffb8db252e39494f8ea68b0a360a4745feaadc20d2fbdb5e70fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 5924 bytes

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