Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb59789f6a9d27e…

MALICIOUS

PDF

82.4 KB Created: 2021-04-18 09:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd6db28303e51e844ff05b974f549b3a SHA-1: bcdb7cf026544c0dcc5b119667561288ce5acb1c SHA-256: 6cb59789f6a9d27eac290530e15e6a1dc4b65526948ae1bd66ed1c2c0d457b11
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure of downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=garmin+oregon+600+install+maps
    • http://dipufuvolog.iblogger.org/galaxy_attack_alien_shooter_mod_android.pdf
    • https://cdn-cms.f-static.net/uploads/4447915/normal_6059f21b727fc.pdf
    • https://cdn-cms.f-static.net/uploads/4386849/normal_603c51e3e96ce.pdf
    • https://givepatodanino.weebly.com/uploads/1/3/6/0/136097232/2794090.pdf
    • http://nixuvukoda.iblogger.org/comme_des_garcons_t_shirt_size_guide.pdf
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/vigoba_gaboren.pdf
    • https://guferewefozitak.weebly.com/uploads/1/3/4/3/134393558/katol_xamori_vifarapisolakuk_wefofat.pdf
    • https://zitujizu.weebly.com/uploads/1/3/4/7/134731650/novovaguniguwasez.pdf
    • http://gajaxujifusokul.mygamesonline.org/sokas.pdf
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5feb946e74b08.pdf
    • http://fijazubelanulek.mywebcommunity.org/periodic_and_non_periodic_signals.pdf
    • https://cdn-cms.f-static.net/uploads/4502188/normal_6011e7ac77958.pdf
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5fed192a86775.pdf
    • https://static.s123-cdn-static.com/uploads/4465719/normal_5fc942281ffc7.pdf
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/3545148.pdf
    • https://cdn-cms.f-static.net/uploads/4493881/normal_6052d54788230.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://solugivewatewa.myartsonline.com/42012495562.pdf
    • https://s3.amazonaws.com/simujix/ford_3000_hydraulic_pump_rebuild_kit.pdf
    • https://s3.amazonaws.com/lebaxa/libudafimadojakapenub.pdf
    • http://kepawomokatuke.myartsonline.com/mupiniwodoletutupoxibupa.pdf
    • https://s3.amazonaws.com/kiwopusafize/botulimaludiwoven.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_off00010433.bin
46a3f155ba7580b2483c5c6a51fda24a7acc4538e7b233c327f6faf965cb2b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 5464 bytes
font_01_sfnt_off000116aa.bin
b8d5c36ad7691d726684caf18efe0bcbfd7c9c2463bc8145ab39ea9d39c2607d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 11116 bytes

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