Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ce5d41fc872f65…

MALICIOUS

PDF

76.0 KB Created: 2021-03-30 10:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b05c3a73e0ec6f66c49b831ddb355591 SHA-1: 7c65f10563059d50a15429b1cd2c38caa3556aff SHA-256: e7ce5d41fc872f65b182f33b2e21ec8e3a99a1a538222fb4ce5e8718981de8c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, flagged as a 'PDF_SEO_LINK_FARM'. One of these links, 'https://kuzutuzo.ru/strik?utm_term=battletech+game+of+armored+combat+mechs', suggests a potential lure related to gaming. ClamAV and ML classifiers also identified this PDF as malicious, specifically as a phishing trojan. The presence of embedded links and the malicious classification strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=battletech+game+of+armored+combat+mechs
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/pozaxifejabigib.pdf
    • https://zavuvomexuwu.weebly.com/uploads/1/3/2/7/132740545/sekusa.pdf
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/xudomodikevobibedu.pdf
    • https://cdn.sqhk.co/duwutawuna/ZEMgdig/ansible_advanced_tutorial.pdf
    • http://jiramowujunobo.22web.org/craftsman_20_hp_lawn_mower_parts.pdf
    • http://tikenifoziv.22web.org/2016_buick_verano_service_manual.pdf
    • https://fugubujezowegi.weebly.com/uploads/1/3/4/5/134502495/narevixev.pdf
    • https://cdn.sqhk.co/vifamepupib/ibghjcv/love_quotes_in_spanish.pdf
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ff0b88f482ec.pdf
    • https://static.s123-cdn-static.com/uploads/4501963/normal_6001809a26a44.pdf
    • http://mejuvepofejumis.iblogger.org/how_do_i_download_apps_on_my_panasonic_tv.pdf
    • https://static.s123-cdn-static.com/uploads/4481825/normal_600155dd9f513.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1fa8a40f-f72f-4646-b28f-f7260351287d/percentile_rank_calculator_jee_mains_2019.pdf
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_c1b6a3842ee7442fbd8fbab2ab5d7150.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12b7c17f-6d09-498d-bbd3-9958deac7666/what_do_covalent_bonds_occur_between.pdf
    • https://uploads.strikinglycdn.com/files/e34fd878-9b35-44f2-952b-4141bc018922/harbor_breeze_remote_for_ceiling_fan.pdf
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_16e6e49286624fcaa270fe9fcb15ca9a.pdf?index=true
    • http://xadiromawa.epizy.com/dujemurujav.pdf
    • https://uploads.strikinglycdn.com/files/17285b2c-5136-4b8f-87de-39e819a83e98/58360824838.pdf
    • http://rizaraj.rf.gd/bodyguard_malayalam_film_video_song.pdf
    • https://uploads.strikinglycdn.com/files/0fca8eda-5067-4cb3-b6db-540e4ecbe247/kiderifavokinagiwuwas.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a4.bin
74f249654b675c56361586658f4100252a9e34f05a6559fff0e37fb027e8c5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 5624 bytes
font_01_sfnt_off0000fc95.bin
6aa790e92adf340597d2e56e4d340917d889529b411cb357293173e1293d937f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 11304 bytes

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