Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a8851e36719d85…

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 19:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7ea36489d010868749305d5612c176d SHA-1: c543e35473c8304ab63189531eae43b27f4d8ab8 SHA-256: 70a8851e36719d8503a4516ebf466b62960a10337cd7919214026edd0dc04280
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URIs, one of which points to a raw IP address, indicating a potential attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://xsteelstock.com/d/files/22872986890.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/xukagasusutafu.pdf
    • http://asude.istanbul/ck_images/files/57495569581.pdf
    • http://daejonggyoyc.com/userfiles/file/20210914182407.pdf
    • http://jonellchem.com/upload/files/zabeban.pdf
    • http://abwmarlboropike.com/uploads/files/35971061901.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/pademafefinefin.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/871683224.pdf
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nokaruruvukexed.pdf
    • http://amghanoi.com/images/ckeditor/files/36636601945.pdf
    • http://211.129.1.225/system/ckfinder/userfiles/files/dodabipujesapatola.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b731824f4a---67286972405.pdf
    • http://acutecardio.ru/sadm_files/xiniwafojix.pdf
    • https://ehlibeytalimleri.com/resimler/files/xagijolidulekojimaxejok.pdf
    • http://chromavials.com/d/files/kidosoxemuboxeluzajewup.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/kosutikokevilisugi.pdf
    • http://canadianrockies.info/files/file/21626868412.pdf
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wemop.pdf
    • http://gocep.org/data/userfiles/files/magovowejotodu.pdf
    • https://contabil-fiscal.ro/mm/file/3387053499.pdf
    • https://wfbulgaria.com/uploads/wysiwyg/files/dokafi.pdf
    • https://turystycznapodkowa.pl/userfiles/file/20154055864.pdf
    • http://interno-kazan.ru/upload/files/14206331428.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+connect+my+phone+to+my+printer+via+wifi
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb5a.bin
6fb05ba34b22cad7c381d0699757b2faadb0d116bc327678a33cbe50b0fb4551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5A 19156 bytes
font_01_sfnt_off0000ed2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16792 bytes
font_02_sfnt_off00010541.bin
b36b4a055d0a0c6ef60724f57bb0ed2531c6a58a4ef653fa3746e855a82c90b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 10928 bytes

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