Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6404abb1ad7d2b…

MALICIOUS

PDF

87.0 KB Created: 2021-04-05 13:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43b7f3c22a64bf6d48e2b71e59d7057e SHA-1: 8411a155dcb37bf02a80075eeab9351f36914720 SHA-256: 2e6404abb1ad7d2b7654bd83b9bf4e0d9ba1bb6f0282f9c333bf6899bd7d199c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book title, likely designed to trick users into clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=the+cracking+code+book+simon+singh+pdf
    • http://varietystore.website/52038268059w9wdx.pdf
    • http://new-volosi.ru/wowetosikijunojavedefitek8klfq.pdf
    • http://frankiearvelo.com/84010676201pi413.pdf
    • http://xrootunited.com/smart_board_online_drawingk9bsd.pdf
    • http://kiwenalod.medianewsonline.com/hematopoiesis_book.pdf
    • http://sun-italy.space/5022429947876l8a.pdf
    • http://copytoshka.ru/black_and_decker_14.4_volt_cordless_drills6xdw.pdf
    • http://serusidam.iblogger.org/mikrokosmos_bartok_espaol.pdf
    • http://jasazotinalol.mygamesonline.org/mac_pro_5.1_user_manual.pdf
    • http://dfds.in/what_is_the_best_macro_ratio_for_bulkingmlmbc.pdf
    • http://boxijogirexu.medianewsonline.com/98772731718.pdf
    • http://goldstein.berlin/vukeduruk3nch.pdf
    • http://wownatural.fun/33242995188ozsih.pdf
    • http://site-shop.xyz/what_not_to_eat_on_a_dairy_free_dietwhlws.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bolovopizonuki/16802825359.pdf
    • http://muzulozak.atwebpages.com/19006035556.pdf
    • https://s3.amazonaws.com/gewisetug/road_signs_and_symbols_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/c1c34bbd-6fa1-4d4d-96ae-a23e03f94da8/down_the_rabbit_hole_book.pdf
    • http://japotegalavig.epizy.com/how_to_control_my_soundbar_with_xfinity_remote.pdf
    • https://s3.amazonaws.com/fedojigudaj/22366747875.pdf
    • https://uploads.strikinglycdn.com/files/1487d7f9-19c6-4911-981d-ca935e435ae0/oracle_database_12c_pl_sql_programming_mclaughlin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001089e.bin
323ddd3b3e514b2a51296c187e0d2a03132a8a529d227de2c2b4d75c3b39751a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 5396 bytes
font_01_sfnt_off00011ab9.bin
122d81349a8afa564a5c1addef84b39057c967d6afd326b8141d8804d05a1791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 11336 bytes
font_02_sfnt_off0001405a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1405A 4324 bytes

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