Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9246a224a6c4484…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 18:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e42cf7f4e89546b93092bec450e78ac9 SHA-1: b42086aff106610ebb5ed33c27fb7ac211bd0077 SHA-256: b9246a224a6c448486dcda0c9a2c0caa89bdbcb0a997307e8b7af1ad3d1f1608
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are generated in a way that suggests a link farm for SEO manipulation. One prominent URL, 'https://dafemum.ru/award?keyword=caste+certificate+form+pdf+mp', is presented as a caste certificate form, indicating a phishing or malicious download lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=caste+certificate+form+pdf+mp
    • https://cdn.sqhk.co/xurinuwame/icaXjjx/descargar_minecraft_pocket_edition_gratis_pc.pdf
    • https://cdn.sqhk.co/rekubapapup/hghcbR5/calendar_2021_template_word.pdf
    • https://cdn.sqhk.co/murafabu/XljhhaR/reverse_music_player_ios.pdf
    • https://cdn.sqhk.co/xulawajikigi/jhOLghD/xonalez.pdf
    • https://cdn.sqhk.co/raxulaxesob/bCNijpR/39997478473.pdf
    • http://fosireditoj.mygamesonline.org/anticoagulants_pharmacology.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_3be10a5e58c44a1c9fcb25abfbf7920c.pdf?index=true
    • https://s3.amazonaws.com/bejokazemur/dagenetosalijilozalimof.pdf
    • http://rotufixijisadi.onlinewebshop.net/14726953047.pdf
    • http://jisunopesaluzi.atwebpages.com/wastewater_management_in_developing_countries.pdf
    • https://s3.amazonaws.com/nakuzafol/jexaxolasifib.pdf
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_bc407ba69aac401b83c7133aae0703dd.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_2534e2779cb641a68ccd61bb9b431c81.pdf?index=true
    • http://givetupazowo.onlinewebshop.net/xadimigo.pdf
    • https://s3.amazonaws.com/vuliwisuwig/91737677333.pdf
    • https://s3.amazonaws.com/pusixa/aj_hoge_effortless_english_free.pdf
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_f6e50a9e7b60421e909ea62f0812e008.pdf?index=true
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_710e28b69cfe4c058e7b91ecd25cdbde.pdf?index=true
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_048b00680b7f40c4a992849fb3290ed1.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_2edfa78fed754aefb5eb6fd603128dd4.pdf?index=true
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_49d08094381144b0ba82469fa078faa1.pdf?index=true
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_c0fa72b110b7403bb1cba276ba8de3f0.pdf?index=true
    • https://s3.amazonaws.com/potofaw/minimalist_blogger_templates_white.pdf
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_61a116a988f44e61806cc68994c1f1f2.pdf?index=true
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_12e93dfb70c443b5a6e63c12e045dce4.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_off0000e56c.bin
4f8e54533ad441d1408607e914bede3cd2ef625590bd7a3997a1a1fe19dcad0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 4972 bytes
font_01_sfnt_off0000f654.bin
d3adb3f17fcedabcbad9fa5eab7ef3b07dcc39fbc0dd5fbd3d1eaa27fa5a8a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 10504 bytes
font_02_sfnt_off00011a5a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 4324 bytes

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