Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef4ac42af118106…

MALICIOUS

PDF

74.0 KB Created: 2021-03-12 03:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d80005b6c1d1f12f90ce849fece5ce92 SHA-1: 2f3381889b24a3dc3d9dcc06cddda5c6b4659e63 SHA-256: bef4ac42af1181065dc3257bc72f03c7b81c07f3eb58829e8d10a1cbfd84d4a3
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://mezovuduw.ru/award?keyword=network+security+pdf+2020', suggesting a phishing or credential harvesting attempt disguised as a network security document. Although no scripts were explicitly extracted, the PDF structure and embedded URI indicate a likely attempt to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=network+security+pdf+2020
    • https://cdn.sqhk.co/zovaratigu/idgieaN/tepunedevugukidi.pdf
    • https://cdn.sqhk.co/junuxuseg/TCCl9KP/battle_up_marines.pdf
    • https://cdn.sqhk.co/pifonode/gdic7im/23741559835.pdf
    • http://shishkin-seed.xyz/what_is_meant_by_hydrogenated_vegetable_oilsh3g5z.pdf
    • http://musofiron.ru/70529036565520x7.pdf
    • http://heleogose.online/remington_11-87_police_shotgun_for_salektnss.pdf
    • https://cdn.sqhk.co/sidogorego/ihVt4qF/wood_letter_cutouts_hobby_lobby.pdf
    • http://sufulilutidake.mypressonline.com/kogujinosena.pdf
    • http://pasikufopubiwo.mypressonline.com/dufurofizizaniwek.pdf
    • http://grenkasalo4.xyz/xukezurejuvevab1ur26.pdf
    • http://nesorus.mywebcommunity.org/the_body_electric_book_review.pdf
    • http://ruluzuzadol.mypressonline.com/how_to_check_hp_instant_ink_levels.pdf
    • http://gufurebu.medianewsonline.com/maulana_ashraf_ali_thanvi_urdu_books.pdf
    • http://webdefilmizle.com/11902419838za0zm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuwedilejom.myartsonline.com/8108509756.pdf
    • https://s3.amazonaws.com/mivokozibu/sedijafiwiliweroju.pdf
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_a3228eb4becb4b6586a3f85f3be91979.pdf?index=true
    • https://s3.amazonaws.com/nuxomigo/elegy_imdb_parents_guide.pdf
    • http://zuxokoberibaw.atwebpages.com/siramunisopakeri.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_95455576e3864923b4b8a58d120595bf.pdf?index=true
    • http://solugivewatewa.myartsonline.com/federal_holiday_calendar_2021.pdf
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_8042e43553f44232b8019d0b254bc8c3.pdf?index=true
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_32bf5e020e784efba7aea28b62090447.pdf?index=true
    • https://s3.amazonaws.com/vufuzewasi/cisco_ccna_certification_exam_fee.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_off0000e361.bin
fbc00de7617141cba6c94ef7434210c1842601e2a1e1cdd1096bcd3945004baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5408 bytes
font_01_sfnt_off0000f607.bin
68496f64e26862ff994b95927a79e202b79cce9ab539e6b52e3f6219ceb6bea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10804 bytes

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