Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9913b8689e19a4…

MALICIOUS

PDF

77.4 KB Created: 2021-03-07 16:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ed8b2d1dfd0d560f95c41fb41fae2823 SHA-1: a10f6eff9ddc6b30683dade4cd3a6b8421eaca49 SHA-256: 8f9913b8689e19a4bf326bdb1d9bca6fdb6e993fb5fd9368860079d98fdba0cc
134 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, including one that appears to be a keyword-based search redirector and another that directly links to a PDF file hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though partially corrupted, contains text related to downloading an 'android apk', suggesting a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://botokaw.ru/wix?keyword=download+chrono+trigger+android+apk+%252B+data PDF link annotation
    • http://genusadnlo.space/retroarch_roms_ps12wa6l.pdfIn PDF document text
    • http://alcozerox.com/vumajuwixuduviipyd1.pdfIn PDF document text
    • http://exampl1214.com/skyline_layton_travel_trailer_reviews3248e.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/ghOMibw/24333088069.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/4ZbUrlE/65976217334.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/QibigYV/monster_truck_driver_3d_mod_apk.pdfIn PDF document text
    • http://nagaxutunasom.22web.org/42202808350.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/Y4zjjhf/choice_of_games_vampire_the_masquerade.pdfIn PDF document text
    • http://nabokuwaj.iblogger.org/89612567945.pdfIn PDF document text
    • http://hihikane.space/kitekonorifiseszfcq.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/eQQido4/20238447297.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/6944cc85-ad32-4e7d-b0ca-951d5c6071f4/21023001277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/323244e5-fc76-4d21-bf61-ebd9755ca564/dead_to_the_world_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26520c72-2ba0-4b09-b859-68a736545e27/87955735491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e1669a-d69b-4d9d-b07b-3210cb388c47/vovadejuzebanafimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb60eea3-5ef7-4a0d-8f64-2b80eddba1ba/the_chronicles_of_narnia_full_movie_watch_online_free_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cd5f45-1b5f-48bd-a7e1-2692b43d176c/how_many_amps_does_a_level_2_charger_pull.pdfIn PDF document text
    • http://zujawuka.epizy.com/8374758916.pdfIn PDF document text
    • http://nanolato.rf.gd/bongo_songs_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/116210c0-666b-4350-ade3-7cf5c6fe754c/logitech_harmony_300_universal_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffc2f2f-945b-4019-b9bb-082b373d3ee2/nabafevubepowofagujapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/188242a2-59d2-4094-b7eb-fc39da14a76c/cules_son_los_sntomas_de_un_cncer_en_el_estmago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c4d12c6-1660-4113-b3f4-1d61ca8985e5/mixogekip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ccfa06d-291b-4396-83b9-c665eb3b134a/85309451664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1852be4-6368-4cd3-bc41-791086a373a1/gobusanatipujedo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 5312 bytes
SHA-256: 062f59bfeac454b372f95e01effe0082f597bf3a3d879aa459530c57e2f7dcc5
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 10840 bytes
SHA-256: 22d1209a50b8b65938545cf3e001e8c242ccb705b4bb34001b00baf69d3e8473