Malicious PDF — malware analysis report

Static analysis result for SHA-256 916369b9b96530fe…

MALICIOUS

PDF

87.2 KB Created: 2021-03-18 21:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3b19e547bf52566471a1eb426f1a726c SHA-1: bbf4e46dd22f094cb6fdd2076665e42ee5c7ca46 SHA-256: 916369b9b96530fe7cd726efeca33fdbf04f8fd631145c51eac8c9f435bfb592
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to 'batman the killing joke comic book pdf', suggesting a lure. The presence of numerous external URIs, many on disposable domains, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=batman+the+killing+joke+comic+book+pdf PDF link annotation
    • https://cdn.sqhk.co/kagelemovo/igCHhay/beat_the_street_driver_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/fFjejjb/stylist_dress_up_styling_game_mod.pdfIn PDF document text
    • http://biweekamnf.com/coleman_mach_15_weightuc14b.pdfIn PDF document text
    • http://webdefilmizle.com/1972122723331yfj.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/hjghdge/84025163770.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/hdhjtRt/5986840887.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/difoYjh/super_smash_flash_2_unblocked_games_hacked.pdfIn PDF document text
    • http://mattelipsticks.site/dead_space_free_download_xbox_onedtud6.pdfIn PDF document text
    • http://kimibifav.22web.org/whats_in_a_lemon_berry_slush_from_sonic.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/Sio6vwh/ninety-_six_school_district_phone_number.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/12th_science_biology_book_in_gujarati_2020.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/96651619777.pdfIn PDF document text
    • http://runaxok.iblogger.org/lupefikimuxovososibexalo.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/Gjbclgf/through_the_ages_board_game_arena.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/hipuibX/square_body_chevy_for_sale.pdfIn PDF document text
    • http://igcopyrightclient.com/how_to_learn_to_read_poetry7kddj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18af996-5807-4bee-bc78-dcde1187d2f1/35850016607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aedadad-3953-4f3f-875c-5788a46a5ca4/cost_volume_profit_analysis_example_problem.pdfIn PDF document text
    • http://kesobiw.rf.gd/what_does_measure_mean_in_music.pdfIn PDF document text
    • http://lidumadinub.epizy.com/55357909301.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_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 5624 bytes
SHA-256: 0feb8b6b383c05227b659e90575ccf7f6be0a8e90644107362b79233ff46dae7
font_01_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 11032 bytes
SHA-256: ea222746cedc08e1de0d846018e910a2381ff529c76ed26e1ed59c1958a9124d

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