Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cfb2e6fb87b03a…

MALICIOUS

PDF

84.1 KB Created: 2021-03-14 12:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a87331113b22678991520dcef457dc6e SHA-1: 9f290a5ad7600706e972720b94c4636804d3e7db SHA-256: b7cfb2e6fb87b03a2caf133f7dc7816e3cec1e155adaf29adef6596472c82342
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a domain that is not confirmed benign, suggesting it is used for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to medical conditions, likely serving as a lure to disguise the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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
  • 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://zajinet.ru/award?keyword=enfermedad+vascular+cerebral+isquemica+pdf
    • https://cdn.sqhk.co/runudori/OngiQjf/bepipiruso.pdf
    • https://cdn.sqhk.co/nenafodud/hbheQhe/business_administration_salary_in_ghana.pdf
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fd8352ebe444.pdf
    • https://cdn-cms.f-static.net/uploads/4418565/normal_602226e003dcd.pdf
    • https://cdn.sqhk.co/kikolibub/LMjcvib/monster_truck_stunts_3d_game_download_for_pc.pdf
    • http://xamawigokoke.mygamesonline.org/5010450342.pdf
    • https://cdn.sqhk.co/mugodetutag/cji8qgj/glee_cast_season_6_songs.pdf
    • http://vizazovabula.mywebcommunity.org/hoover_elite_rewind_upright_vacuum_cleaner.pdf
    • https://cdn.sqhk.co/vulovosovem/hiQ0a3w/semavawuwewi.pdf
    • http://peromopativej.mypressonline.com/ipad_mini_keyboard_case_for_sale.pdf
    • https://cdn.sqhk.co/pizuremo/ZgcijGW/46413207091.pdf
    • https://cdn.sqhk.co/punipopi/PjdghBb/27371148643.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woxojuxafopuv/printable_yoga_cards_free.pdf
    • https://s3.amazonaws.com/gogonof/jax_build_guide_s8_jungle.pdf
    • http://bitujiduruv.myartsonline.com/ryobi_2000_psi_pressure_washer_parts_home_depot.pdf
    • https://s3.amazonaws.com/fazujo/where_the_wild_things_are_voice_cast.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/98065315787.pdf
    • https://s3.amazonaws.com/wetowuzuxit/decimal_calculator_timesheet.pdf
    • https://s3.amazonaws.com/nilititonawafim/10922892326.pdf
    • https://s3.amazonaws.com/besafefaf/wozaxodalifev.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_off00010a5b.bin
fc23e28a5d3a0a5297187f0eac2031cb08f0b6ad17a041f4a003e2d1659bae5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 5584 bytes
font_01_sfnt_off00011d46.bin
7a4576bd7ad2bc8b1e20b7509fd59c491c197927ebd3529d89d8e8f7fe75af46
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 11036 bytes