Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86fd29e77d44a0a…

MALICIOUS

PDF

74.0 KB Created: 2021-02-16 01:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9072bbc910a8b3c18edc694f0ba6e4d7 SHA-1: fadda63a799761f3311d1ad09ab7dc638ef77601 SHA-256: a86fd29e77d44a0a08ca879784097f3e9f5c48c9809ea7abc9e38d9e8a28775f
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a link farm and a phishing lure, with a high ML score and ClamAV detection confirming maliciousness. The embedded URL, https://maypoin.ru/wb?keyword=nyssma%20registration%20deadline, is likely used to redirect the user to a malicious site or download a payload. The document body, though heavily obfuscated, contains keywords related to deadlines, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://maypoin.ru/wb?keyword=nyssma%20registration%20deadline PDF link annotation
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/cce0d907a0b.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/cPV9jji/fantasy_flight_games_star_wars_rpg_review.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/giiaby7/house_party_movie_free_download.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/d553ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5fdf68da69680.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/Uekkgcz/compress_video_for_discord.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503033/normal_5fe00dab0da63.pdfIn PDF document text
    • http://vienvozvrat.site/83232654305eptm4.pdfIn PDF document text
    • http://koteyarn.moscow/atheist_books_in_urdurgmjj.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/employee_attendance_tracker_excel_s.pdfIn PDF document text
    • http://genusadnlo.space/135243354387o7jw.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/niluluratulijotoved.pdfIn PDF document text
    • http://vykupavto54.ru/electrical_circuit_symbols_worksheet70b03.pdfIn PDF document text
    • http://bavunexebiri.iblogger.org/aggiornare_android_huawei_p8_lite.pdfIn PDF document text
    • http://nat-yoga.space/everyone_piano_sheet_music_let_it_gopl2ws.pdfIn PDF document text
    • https://lupagizan.weebly.com/uploads/1/3/1/6/131637074/a4f16c.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/eHhe6gg/cheap_flights_to_hawaii_from_slc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzaduvopixu.rf.gd/wallpaper_hd_love_girl.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/vpn_master_unlimited_proxy.pdfIn PDF document text
    • http://kijaripejugap.epizy.com/fimoragovalofizusunekeg.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/productos_alimenticios_innovadores.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_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 5216 bytes
SHA-256: a6a137b8fe5be145c03f560c439c1bfb54d17700afde931f8087747a04566443
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 10844 bytes
SHA-256: 274bfd52f8689c3ef02c5a2c4693e9ee9c46850d08defd0b854e1d953c9143c1

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