Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e11db71aabaa2b3…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 01:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0aa45bd1f3287e53b028946c6d8d5916 SHA-1: 164e13532c48f017b205b4dc1ffd64b75d0300b2 SHA-256: 7e11db71aabaa2b351ae0715a4e2a06016381d56d1c655cb00869f8d276767a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, 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 URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=quran+majeed+apk+pro PDF link annotation
    • http://clickvay.com/upload/files/37720316701.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/laxap.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/zefelefomoxuj.pdfIn PDF document text
    • https://vpmemorial.net/images/file/22698683402.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/31980171349.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/wisawinajazelusafawel.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/bitiwipe.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/76741419102.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/36251139183.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/77334453483.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/turifal.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/sebeto.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/nemodasuzigaz.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/22234159377.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/61844024785.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/ramiralikabowaxe.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/foduzuzepiw.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/23908804707.pdfIn PDF document text
    • http://salwex.hu/file/lezizuzes.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/31680933775.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9aa2d608---fabujorudu.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/5902598105.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/jewerunufesejemujanusipi.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/78435056626.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 10532 bytes
SHA-256: 3c76d0070e2632b9a5f159633825c52b07c79c0575df7ef21540a82e3ceeb611
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 20132 bytes
SHA-256: da7d863b056ea10b96ec1d50ebbe24070d10d60f7300439acc495c74ca263e2b

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