Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf9873cd6744c48…

MALICIOUS

PDF

81.1 KB Created: 2021-03-01 10:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f1132ad35ae10d18ec702517889a752e SHA-1: ddf3ff69df704efd93635362e285ae45964c0ed2 SHA-256: baf9873cd6744c481aa9dd3aade9058e4a274c78710ca12a4b6dce0fa517b28e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=the+monkey%2527s+paw+setting+analysis PDF link annotation
    • http://servempieza.site/ridgid_10_dual_bevel_sliding_compound_miter_sawmxhym.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/bjidt3t/77562208497.pdfIn PDF document text
    • https://cdn.sqhk.co/woferomot/iEsggge/xiseji.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/h8jfMij/35904119092.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/jcid7jh/car_rush_crazy_games.pdfIn PDF document text
    • http://khareedforosh.com/the_crown_episode_season_1_episode_4war2r.pdfIn PDF document text
    • https://cdn.sqhk.co/mudebijutene/ig7jaVG/32414139605.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/itIuljj/gurosa.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/bhcheCX/inoty_style_i_os13_apk.pdfIn PDF document text
    • http://vujakaz.iblogger.org/geography_bee_study_guide_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/RHhgwji/powes.pdfIn PDF document text
    • http://selolaz.66ghz.com/vidmate_free_for_android_tablet.pdfIn PDF document text
    • http://msertis.xyz/database_management_systems_are_aimed_for_bankinggx2kp.pdfIn PDF document text
    • http://daxofili.22web.org/washington_football_team_quarterback_hurt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofezaniv.rf.gd/astro_navigation_software_free.pdfIn PDF document text
    • http://memujagitukeza.epizy.com/good_st_bernard_names.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_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 5376 bytes
SHA-256: e13872c5138be6649927360f300a02d42d0841635720423818cafb94204e5fea
font_01_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 10520 bytes
SHA-256: 799158270a07415ca804aebe541b71c7073870b491a0a4c825b6d1ae73f7e8b7

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