Malicious PDF — malware analysis report

Static analysis result for SHA-256 499db41a7cbf5192…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 22:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ae8f568c2b139937635b0226e2bc365 SHA-1: 7b454d4c4c813e7e7c155e247ad14724f4e57d84 SHA-256: 499db41a7cbf519207a4696cd6f126dbbacffd23c0dbad1e5d1d55471f9a4a7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains numerous external links, with a significant number pointing to other PDF files, suggesting a link farm or redirection mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common social engineering tactic. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ponafet.ru/wix?keyword=movies+online+hd+1.0.1+apk
    • http://13millions.store/temopoloxuzosijezokk71x.pdf
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/592846.pdf
    • http://formulamoney.top/jinowetosiwuvikxet19.pdf
    • http://lg-supportteam.com/10845956204lg2rp.pdf
    • http://generatorsale.ru/panda_express_menu_sweetfire_chickena073t.pdf
    • https://zufesuvagudinaf.weebly.com/uploads/1/3/4/3/134321689/lumatexeba_vetuluso.pdf
    • http://nesakud.mypressonline.com/1994_yamaha_timberwolf_250_carburetor_rebuild.pdf
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/fawovudonixa.pdf
    • http://jasazotinalol.mygamesonline.org/81546815642.pdf
    • https://cdn.sqhk.co/resesexiraf/ieVheFm/92120566724.pdf
    • https://cdn.sqhk.co/zuvaworizon/8hdhXuW/tobomugeberitoxoziwigate.pdf
    • https://cdn.sqhk.co/devepogisog/jaRxmig/loudest_alarm_clock_sound_on_iphone.pdf
    • http://changely.club/can_you_build_muscle_with_bowflexa8vsz.pdf
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/8589855.pdf
    • https://cdn.sqhk.co/butuxolevu/NjiiejI/watarakizadax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_4774b467a8e245e7a42364f5824437f1.pdf?index=true
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_690eb4377ea747ed9742fcd1932f7a16.pdf?index=true
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_f8b8a967028146b587633bc11ed1b6f4.pdf?index=true
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_4b6553ad07e541c9a7177a2600583b0a.pdf?index=true
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_e296a38ce53b4c48bb64e5cbe8f1b96e.pdf?index=true
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_d4537913c578465f9c1a2e29742c0719.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_dc55477c0a1442eea77c493e3f7c5e46.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f104.bin
abca3846025acbc02408b85451996f74bfc968631ee05cd0cf1f7fb0dd8fae7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 5304 bytes
font_01_sfnt_off00010322.bin
413742f4dfbf4b4b6d88988caa3dd7957d4c61aec32a7fb636c914f64fe1e533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 11352 bytes

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