Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4dde6989f192f1…

MALICIOUS

PDF

101.4 KB Created: 2021-02-12 23:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7e78b878e342bde356290bd483a2e7fb SHA-1: 2dc7ce3f97b623e8067a44739b51fde762ae61e8 SHA-256: ab4dde6989f192f12ac5adc8d825dfda6a4fa66c9b476c35f7c90e5251f40afc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bologen.ru/123?utm_term=physical+maps+of+south+asia PDF link annotation
    • https://cdn.sqhk.co/kenipafitu/dWU7ihv/zukiwotat.pdfIn PDF document text
    • http://7evenrp.ru/4155565114rn5r9.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/uWqgeu6/89161751050.pdfIn PDF document text
    • http://4kuhd.me/keto_dessert_cookbookk6f1c.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/jFkpjar/96985552549.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/2jaijjg/nenikime.pdfIn PDF document text
    • http://znatural.space/bhagavata_purana_sanskritcio5d.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/cvjichg/otherworld_legends_apk_mod_1._0._12.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/ijQ8Qhb/bmx_boy_game.pdfIn PDF document text
    • http://whitetwo.space/switchblade_knife_for_sale_ukjkn2a.pdfIn PDF document text
    • http://mkr-olimp.info/jusuxidatokixf8bsq.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/jdUHjeK/xogenagepewit.pdfIn PDF document text
    • https://cdn.sqhk.co/nujodusuwud/7hajage/72379525349.pdfIn PDF document text
    • http://sport-stavki.fun/vuduxobj7vbt.pdfIn PDF document text
    • http://bonus332.site/27212872564m3333.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/QjiCCNR/flight_simulator_2020_argentina.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/gh7Mibs/83394355722.pdfIn PDF document text
    • https://cdn.sqhk.co/giboxikewev/jgjepgi/69320924762.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/fcgjX9D/nuzaf.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/adjbgg0/hong_kong_style_mahjong_games.pdfIn PDF document text
    • http://remontvorot24.com/gasoline_tank_truck_emergencies_guidelines_and_proceduresp7hb3.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/6zaajA6/bus_driver_simulator_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/ehhWjc9/guwexinikagurusak.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA9 4920 bytes
SHA-256: 6805337ab13c0dc42766301801b1b137ce2227044a025829460c8ddbccc8be08
font_01_sfnt_off00014f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 11944 bytes
SHA-256: c49a2e79c2974244a4a4a90e2d6bd1e5e9ec1b82672a7296efe8236f96cd404e
font_02_sfnt_off0001781b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1781B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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