Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fc1691eb690ee6…

MALICIOUS

PDF

79.7 KB Created: 2021-04-05 02:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 693e6175d5cdfb6f8339281b5c54de5a SHA-1: ba3d2cde16d6953b8d585656b2d53bf1bb8901e2 SHA-256: 33fc1691eb690ee6146f0591dd8069f32fa5d7cdcdf5b3c430a741826ad9716f
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious external URI pointing to 'vilenefex.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to scientific phenomena, aiming to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=capillarity+and+wetting+phenomena+pdf PDF link annotation
    • https://cdn.sqhk.co/mivufarowiwi/ialsgii/88909372632.pdfIn PDF document text
    • http://stankoff.org/ignore_the_guy_get_the_guy_downloadyn50w.pdfIn PDF document text
    • http://supermagazforsale1.xyz/abbani_teeyani_debba_video_song_free_downloadjhp7m.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/RPgijw9/clash_of_kings_mod_apk_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d2b302-d5ab-4921-a495-189c7f671614/letra_cancion_yo_sin_tu_amor_camila.pdfIn PDF document text
    • http://pofitubawonu.atwebpages.com/assessing_grammar_purpura.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/33431048062.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_499a734777794138840cb9a9690177ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/faa_ads_b_performance_test.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/flatpak_user_guide.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_55641bed210f4ad3aef2fd3dc804e550.pdf?index=trueIn PDF document text
    • http://kemesid.onlinewebshop.net/nerilad.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/are_murray_riding_mowers_any_good.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/ccna_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84cf0aa4-bf4f-4f0f-b435-1150ecf1722e/mcdougal_littell_math_course_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e463e4-3d44-4a66-b3e3-c4e633d2006d/codigo_de_etica_del_trabajador_social.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e0d2b9-2c5a-4a87-b8c6-feb4c31a2b40/66693100581.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 5376 bytes
SHA-256: ebea05805700b9481ce14d56106f079e795bffe58c6028270b7c4da654704c20
font_01_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 12620 bytes
SHA-256: e526b4bbca01ba0900428038a5ac057b13fea86aee94e7455ff24b891667da9e
font_02_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 16244 bytes
SHA-256: 846fd862c631c6b3df59227c757b13fa3e8bf349cbaaf065684957ab52acf930

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