Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7305e50fd8ee150…

MALICIOUS

PDF

80.9 KB Created: 2021-03-22 22:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d56f5d3d829ab9ca07c652fe38fa2323 SHA-1: 3c0474d5341d6ce2e24d601556acf48d1fa289a5 SHA-256: a7305e50fd8ee150635d1fed590df2ce2b3882c9b4dc6fcc3a1fc4b105c92f4a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', directing to various PDF files hosted on external domains. One heuristic specifically identified a PDF link to an algorithmically-generated URL, suggesting a malicious intent to distribute further content or phish users. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mezovuduw.ru/123?utm_term=aldiko+book+reader+app+free
    • https://cdn.sqhk.co/ganuniwiku/cjbkWgf/franchise_hockey_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5fd2d651a8930.pdf
    • https://javexediwoxi.weebly.com/uploads/1/3/4/5/134584379/ecfc96151.pdf
    • http://fastnoutservice.ru/employee_disciplinary_action_form_word_templatebonvj.pdf
    • http://driveformclanemilwaukee.com/824464336050vb1v.pdf
    • https://cdn.sqhk.co/kosibowo/ibxibie/74680739605.pdf
    • https://static.s123-cdn-static.com/uploads/4385424/normal_5fe17052d1116.pdf
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/f374136a2a.pdf
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5feb72e46a711.pdf
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/bulemawuraga-pokuwaxasafub-nifawekawo.pdf
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/8079828.pdf
    • http://artyom.guru/kenwood_ts-570dg_reviewj4nig.pdf
    • https://cdn.sqhk.co/zojixemem/8ahgjgz/vigesefidalurinevobuxiwus.pdf
    • http://mestorating.ru/nolodutanubevuxodibuliwodfubud.pdf
    • https://cdn.sqhk.co/wesaduleb/jcqicgh/no_speed_limit_sign_nsw.pdf
    • https://cdn-cms.f-static.net/uploads/4478932/normal_60500f80ee221.pdf
    • https://cdn.sqhk.co/rapovixovuti/jhf5haH/make_it_perfect_game_voodoo.pdf
    • https://jonenatone.weebly.com/uploads/1/3/1/8/131872225/6ebc9044f87ebd9.pdf
    • https://cdn.sqhk.co/zolewiko/iYjeijx/spacex_dm2_crew_dragon_mission.pdf
    • http://cleanup-sale.site/960940632736s4sl.pdf
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdf
    • https://cdn.sqhk.co/kosadara/jfhiyjd/star_trek_starfleet_command_pc_trainer.pdf
    • https://cdn.sqhk.co/zotipimesaza/djixbvN/pufikusaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sojebelevenex/accutire_ms-4021b_battery.pdf
    • https://s3.amazonaws.com/vuxalirudidel/amityville_horror_movie_1979.pdf
    • https://s3.amazonaws.com/nefagolom/73056765561.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_off000100fb.bin
815ce466092327356e353553448bbcaf6d94562822224adaa9358fcc5f41a042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 5052 bytes
font_01_sfnt_off00011232.bin
18ba4d036fecf38dcc721bfbb2dbf1218a50ef43df54a9887480642de0bc762d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 10432 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.