Malicious PDF — malware analysis report

Static analysis result for SHA-256 29af5b2c0b1f627d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-31 17:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bea5fdf95e4f52f057938654d84b4a4 SHA-1: 0580e3081391a701909c24749c260d339503ac5b SHA-256: 29af5b2c0b1f627d4c08770afc1d05aa79e6fc2ba9355c18111627e1e8d1a864
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a large number of PDF files. The primary malicious URL identified is vilenefex.ru, which is likely used to host or redirect to further malicious content. The ClamAV detection and ML classifier also indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7176

Heuristics 4

  • 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
  • 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://vilenefex.ru/award?keyword=brachioradialis+rehab+exercises+pdf
    • http://rutenowataba.iblogger.org/buzoxikosini.pdf
    • http://wobijovo.22web.org/tilogupomur.pdf
    • http://taygerr.com/osmosis_and_tonicity_worksheet3kfq0.pdf
    • http://lnstagram-help-businesss.com/72210395942dkxs8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tividisexagit.epizy.com/xevuneputisuvov.pdf
    • https://s3.amazonaws.com/fizup/2912330233.pdf
    • https://s3.amazonaws.com/bomupi/94410833700.pdf
    • http://nilezowavegat.rf.gd/oligopoly_market_structure.pdf
    • https://s3.amazonaws.com/sitok/amr_diab_albums.pdf
    • https://s3.amazonaws.com/zunaduxa/socratic_seminar_worksheet_4th_grade.pdf
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_bc5e18f14bb44d85b6be86a366c3327e.pdf?index=true
    • http://gidatefasu.rf.gd/understanding_body_language.pdf
    • https://s3.amazonaws.com/desenaz/avp_alien_vs_predator_mod_apk.pdf
    • https://s3.amazonaws.com/mukut/sutimibegilebizizuxabet.pdf
    • http://gozadowosib.rf.gd/celebrity_equinox_deck_plan.pdf
    • https://s3.amazonaws.com/tobaziw/hp_pavilion_dv6000_webcam_drivers_for_windows_7_32_bit.pdf
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_106d7bb86e094611a2d38ae1bf336a57.pdf?index=true
    • https://s3.amazonaws.com/lorifumofelu/54189418448.pdf
    • http://zekajawud.epizy.com/63950695057.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f557.bin
1d80b1a5626beafa0365515b27092bc5122fce560fd0c42e7d8033ceed2a92fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 5500 bytes
font_01_sfnt_off00010802.bin
8b6de6eed11fd5f415a95c034109e8f4dbbe2948e4a760b82f19c56a08da0f5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 10816 bytes

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