Malicious PDF — malware analysis report

Static analysis result for SHA-256 5061302983c9d8f3…

MALICIOUS

PDF

73.7 KB Created: 2021-04-04 00:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54a885e0acf603d3937939714ebeb68b SHA-1: b1da68112ac7d0f70323a91a6483c35dffeb27ba SHA-256: 5061302983c9d8f367541a70bff7963adfba2fef0a1b2b2439cc53e9e6a3cc94
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of numerous links on disposable domains, reinforcing the malicious nature of the document.

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 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.
  • 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://bologen.ru/wix?keyword=memorias+de+un+amigo+imaginario+pdf
    • http://it50off.pro/property__casualty_exam_secrets_study_guidejjuuv.pdf
    • https://cdn.sqhk.co/wotirixa/bygftgg/soronelavejavakudup.pdf
    • https://cdn-cms.f-static.net/uploads/4502188/normal_601ed67bea690.pdf
    • http://opt15.ru/zomikipegopuzdqk2j.pdf
    • http://bixekakazozerol.mywebcommunity.org/convert_to_word_large_file_free.pdf
    • http://hookup153.space/poludibadepojabisixavozfy079.pdf
    • http://insurancecarusa.com/noxiworizinokosozexad98ats.pdf
    • https://static.s123-cdn-static.com/uploads/4403531/normal_5ffdaff81aede.pdf
    • http://melowew.scienceontheweb.net/chess_guide_book.pdf
    • https://cdn.sqhk.co/wibafozadil/aGbiafI/pokemon_fan_art_wallpaper.pdf
    • https://cdn-cms.f-static.net/uploads/4393901/normal_6030d49b108d2.pdf
    • https://cdn.sqhk.co/xexogataza/goicjcn/super_mario_run_world_2-_3.pdf
    • https://cdn.sqhk.co/xugavizira/Qwgijii/83925681259.pdf
    • http://ribadubeko.scienceontheweb.net/15584090244.pdf
    • http://tixesikixux.mygamesonline.org/47800641856.pdf
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fee549160927.pdf
    • https://cdn.sqhk.co/buganisazobu/iiJgcyV/13470880344.pdf
    • http://pressit.fun/harbourvest_global_private_equity_ltd_annual_reportsbom7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nivepaxu.rf.gd/43743390712.pdf
    • http://milodip.epizy.com/55037502621.pdf
    • https://uploads.strikinglycdn.com/files/d5886ff0-df2e-48ab-84a2-28eebcacf12f/pibozamekalogupezi.pdf
    • https://uploads.strikinglycdn.com/files/e7e661c3-47f4-4fc8-b93f-3f447351bd4f/how_to_learn_game_development_reddit.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_off0000e0ff.bin
87f2ea685de557e1f73f23d8b4110507524ab84a63f06ba2fd9e53621e68e324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 5336 bytes
font_01_sfnt_off0000f318.bin
87f85dc29990101543134899873f4d628832816a7da741d5fe45f2e85feac8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 11364 bytes

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