Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc863e9b231fedd7…

MALICIOUS

PDF

106.9 KB Created: 2021-03-08 18:17:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7aeac83ea6224069ed7dc03d1171f5c1 SHA-1: b16aafaa8d52c025257b6e6cd636dd710653e911 SHA-256: fc863e9b231fedd7221af6b3cf6dcfb227a08d3ff9f9bfb63e93df11c5e2f3d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting domains and are associated with link farm heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to aircraft performance, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=beechcraft+king+air+e90+performance PDF link annotation
    • https://cdn.sqhk.co/lokijuzim/Nkicgfu/boom_doom_theme_park.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5fc593c1c8dcc.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/kaloregixuv.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/65164321302.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/jjijigj/zombie_combat_simulator_apk_android_oyun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/icheXjh/52269592800.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/26582563032.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/84879578408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcaa605162e4.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/bjajfUl/wuxiaworld_battle_frenzy_comic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vugapadilubokis.epizy.com/cobit_4._1_assurance_guide.pdfIn PDF document text
    • http://fikapitisox.rf.gd/harvest_intermediate_chinese_workbook.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_479d3777de214ff9866ab6e5498e1140.pdf?index=trueIn PDF document text
    • http://wamunezufim.rf.gd/rocking_horse_nursery_southport_ofsted_report.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_80b8b5e7b79a47a7b5a12c71b3ab37e5.pdf?index=trueIn PDF document text
    • http://zagofij.onlinewebshop.net/how_much_is_uworld_usmle_step_1.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/34476085459.pdfIn PDF document text
    • http://kipenul.epizy.com/mivipogi.pdfIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_7b2fa034522f48f1808d0b1d32e2446e.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 9672 bytes
SHA-256: f252cd2cf8e8c1ca6cdc9bf9b2c8c5a6f561c1b554ff2aa9ec6a8bc3eecebb01
font_01_sfnt_off000157a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A1 5416 bytes
SHA-256: 03a4af0d8601d6bf7cf82ea8a078f241c780578c4d8351328b1a20075297793a
font_02_sfnt_off000169db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169DB 11164 bytes
SHA-256: 078819688582ad3d4a903fdb4edd929d5f2fe1832996530948dd1c4651b1cc6a
font_03_sfnt_off00018ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FF9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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