Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4565e03078d70e…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 04:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03a1a6f7d185ae85e534ea994891b047 SHA-1: 5b339e1fbdd9797058be183602099e7eb45c8f33 SHA-256: be4565e03078d70e17e590ff9915c017d9d05a40a72f05332ba7bc5ffbd20ea7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns point to a malicious intent to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inwebjor.ru/uplcv?utm_term=how+to+send+from+ipad+to+android
    • https://iwanbim.com/userfiles/files/savutedurageti.pdf
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jonalibaxuvebal.pdf
    • http://xy-interior.com/uploads/files/202109020032223355.pdf
    • http://xinghui.co/upload/ckimg/files/202109050814129227.pdf
    • https://cncostruzioni.com/userfiles/file/bopor.pdf
    • http://curvesncontours.com/userfiles/file/85823923905.pdf
    • https://itexpertdog.com/upload/files/molidajuniforomesijexowez.pdf
    • http://crescentcarpets.com/userfiles/file/zugikanipelube.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/xidokosenupefujokel.pdf
    • http://bpabv.nl/uploadfiles/file/51068798508.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/38320536065.pdf
    • https://www.pessin-location.fr/ckfinder/userfiles/files/16477929583.pdf
    • http://mrybalko.ru/files/molevonesusatunemagavu.pdf
    • https://cafemocion.com/userfiles/file/niropimajamoxe.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/98b191659a801d32373133762b024946/35445409059.pdf
    • http://hndgyl.com/v15/Upload/file/202192525107090.pdf
    • https://bkairconditioner.cloud4demo.com/uploads/files/69904524056.pdf
    • https://molecult.metallo-tests.ch/sites/web/upload/files/20603877549.pdf
    • http://naim.naparts.com/images/fck/file/94979187231.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/94885848088.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed467b73c---95285987901.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/81321170832.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://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_off0000ad83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD83 16792 bytes
font_01_sfnt_off0000c595.bin
9f044f5bff682a8b2b07b1c26fa58a10322521d6db2007fe6c7cb766133c65f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC595 14924 bytes
font_02_sfnt_off0000eae9.bin
66c791e581b7af6be557d481450835bf0a78f7f90bdd4e63b922e8b91b953763		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 10692 bytes

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