Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc916f709aec7ff…

MALICIOUS

PDF

83.6 KB Created: 2021-03-23 15:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2662b6bddffffa8af40fea20056fc13b SHA-1: b985b7354c532c98b9d8a5e9a4a3a6935ccda83b SHA-256: 5bc916f709aec7ff49f383b21c73af04ac237cdc9ba5352ffb3af12f56e56f55
166 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document content likely attempts to trick users with fake financial instructions. Numerous external URLs were extracted, many hosted on disposable domains, suggesting a link farm or redirection infrastructure for delivering malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://resalured.ru/wix?keyword=check+your+checkbook+skills+worksheet+answer+key
    • http://levelupguild.com/80653719882qevv8.pdf
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5ffd81e6733e0.pdf
    • http://usersonlineguardingsettings.site/6767749678824mh7.pdf
    • https://cdn-cms.f-static.net/uploads/4451039/normal_601421edd4340.pdf
    • http://busivel.xyz/sikizefobubumunipenuh7mzm.pdf
    • http://reawont.online/love_poems_for_your_wife_on_her_birthdayedqcr.pdf
    • http://sodahub.pro/how_to_buy_warcraft_3_frozen_throne9y0v8.pdf
    • http://beririka.scienceontheweb.net/the_vampire_diaries_painting.pdf
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/ranibijotaxe.pdf
    • http://mikazuxo.mypressonline.com/scrambled_sentences_worksheet.pdf
    • https://komipakokituk.weebly.com/uploads/1/3/5/9/135993761/boxogogitote-lopokosapa-rotaxo-xeviz.pdf
    • http://zixudivibudizu.scienceontheweb.net/filosofia_del_derecho.pdf
    • https://cdn-cms.f-static.net/uploads/4420775/normal_601a1d1d6340e.pdf
    • http://dreamingdeveloper.com/17_day_green_tea_diet_meal_plan8gnqo.pdf
    • http://kivolugog.mypressonline.com/80598399825.pdf
    • http://allwoman.site/gujofekuxidowogixuduguh.pdf
    • http://importants.space/90644311247vub7y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rujabepifar/39938521192.pdf
    • https://s3.amazonaws.com/tiniruru/81917900094.pdf
    • https://s3.amazonaws.com/farezelof/beginner_classical_guitar_tab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010669.bin
5d8e671d781f5c2ee59e97ff94a8507beccabfa57e6317c8bdfe2652c058153f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 5188 bytes
font_01_sfnt_off0001181c.bin
4c49804e0b48b6e8e8120f9269e64861ed1ee86a779ce0e397807c5a520c8582		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 11872 bytes

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