Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9bba34ffb56c51…

MALICIOUS

PDF

80.7 KB Created: 2021-03-22 00:35:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c0b6faa8990d8e9d67079699033f635 SHA-1: 420e6ec92f95788625e9195b65c61c87f82961a8 SHA-256: ff9bba34ffb56c5145b7227bb793eda508353d588a174ac48cd9e2bc4e925729
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as malicious by a machine learning classifier and ClamAV, which detected it as Pdf.Phishing.Trojan. The presence of an embedded URI and a heuristic indicating a visual download button suggests a phishing attempt to trick the user into downloading a payload. While no scripts were explicitly extracted, the PDF format and the nature of the detection indicate potential for embedded JavaScript or exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dafemum.ru/123?utm_term=excel+vba+index+match+in+another+worksheet
    • http://bavedibigilomit.66ghz.com/wedding_rsvp_list_template.pdf
    • https://cdn.sqhk.co/goganededem/jgI6fdy/98167313844.pdf
    • https://cdn.sqhk.co/nulaliki/Qh8hihf/lexanipibujunakutowaxitod.pdf
    • https://cdn.sqhk.co/niwonosorude/rbshiii/music_app_for_galaxy_a20.pdf
    • https://cdn.sqhk.co/fibapezo/DgjlhgG/center_game_apk.pdf
    • https://cdn.sqhk.co/naliwanik/hhf7Ior/retro_arcade_games_machine.pdf
    • https://cdn.sqhk.co/mixaluwekitu/idjjXmq/ruzolirep.pdf
    • http://jojalipubawil.22web.org/digimon_world_dawn_digivolution_guide_dna.pdf
    • https://cdn.sqhk.co/penuvipaw/gggfhdm/72804576541.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jixeremipet/maxigelinuteraxulon.pdf
    • https://s3.amazonaws.com/palikuvexake/java_11_jre.pdf
    • https://s3.amazonaws.com/vifusupegiza/slideshow_powerpoint_template_free.pdf
    • http://nekofixas.rf.gd/abashiri_japan_guide.pdf
    • https://s3.amazonaws.com/xakajoziwibi/aristotle_poetics_in_hindi.pdf
    • https://s3.amazonaws.com/tobovunoberiki/runenosojabovot.pdf
    • http://labujuf.epizy.com/duvas.pdf
    • https://s3.amazonaws.com/wexoteluwag/55616079567.pdf
    • http://sevezogare.rf.gd/automated_hardware_testing_using_python.pdf
    • https://s3.amazonaws.com/midaguvimabof/schooled_by_gordon_korman_activities.pdf
    • http://foraxevub.rf.gd/luvotapogu.pdf
    • https://s3.amazonaws.com/defipedibe/health_economics_group_benny_card.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_off0000fb26.bin
a8127fabda3b0dcc00e01b1bdbd731af0811da642a1c0dedf457e549262008fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 5560 bytes
font_01_sfnt_off00010df8.bin
a18cdcfa9017b5a1e4c547e1dfa91def8bd93ce09d165af40ecc133e7a592251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 10940 bytes

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