Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3ad395fe0c2959…

MALICIOUS

PDF

76.1 KB Created: 2021-03-26 05:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1e8f4fe2b152c1869f348488b1d96597 SHA-1: 19b208eec6970a1ab6bb4a69a295eb10a4ff2ca2 SHA-256: ff3ad395fe0c29591ab0293e9c05d6deb2687d7fa55a9df4dd272e75c77123b7
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, exhibiting characteristics of a link farm on disposable hosting. It contains numerous URLs pointing to other PDF files, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates an attempt to disguise malicious content as legitimate resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/award?keyword=6th+grade+math+decimals+worksheets+pdf PDF link annotation
    • http://alkim.xyz/economics_hubbard_6th_editionu3arb.pdfIn PDF document text
    • http://astropsychology.site/sogibal5u09.pdfIn PDF document text
    • http://copyrights-notices-helps.com/97265923203ffwme.pdfIn PDF document text
    • http://giftcard-sale.store/netgear_router_c3700_reseti7c5d.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/diCT8hd/among_us_online_game_free_download.pdfIn PDF document text
    • http://afracheat6.xyz/duxudofif80glr.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/gjjb7gh/6294211977.pdfIn PDF document text
    • http://esplus.pro/wakapircrjhz.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/0ogegej/monitoring_internet_speed_software.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/6181839608.pdfIn PDF document text
    • https://cdn.sqhk.co/zepaginu/HEiahhT/wimejiva.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/dgd8zud/crossfire_trail_movie.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/most_important_topics_in_physics_for_jee.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/47033993382vqum8.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/ariens_st824_carb.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/lilimuzawedev.pdfIn PDF document text
    • http://optarfes.com/73631964839bolah.pdfIn PDF document text
    • http://watertea.space/how_to_beat_stress_interviewucygh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/dalulejuneviv.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/nuwapu.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/nenupe.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/h2o_x5_steam_mop_instructions.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/belajar_tajwid_lengkap_beserta_contohnya.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_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 5784 bytes
SHA-256: aa47b546ccbe064c2de8ba00fa731c525c1878ffb260fe5c8a9454a47b12ab54
font_01_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 10828 bytes
SHA-256: 5b67f84fff90327859cb23db0428ca41c8501bc61205b836e17b7faa8352e49f

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