Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5af8207f4134c24…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 18:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0c2b3252bb389e9ff8cf6fd0acb7d95 SHA-1: 9c61af88ecb010d308ce9aeb451d4f118f620156 SHA-256: a5af8207f4134c24753f5f8ab851ac9a40b2feb89f17edd2786ded69beffb076
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a downloader or redirector to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role in a link-farming or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=how+to+get+robux+playing+games
    • https://clove7.com/userfiles/file/jifibudawolep.pdf
    • http://indagosrl.it/userfiles/files/8914168545.pdf
    • http://dhf-china.com/d/files/23353114140.pdf
    • http://hublihorse.com/uploads/userfiles/files/bizegijubos.pdf
    • http://haithuanphat.com/uploads/files/penaxifolozax.pdf
    • http://packturf.fr/files/visazusapanarenorokizivut.pdf
    • https://sharmtocairo.com/userfiles/files/19027554309.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/tejujasaj.pdf
    • https://recapress.com/ckfinder/userfiles/files/39721265548.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132084f66af5---80457267826.pdf
    • http://4chan.ro/UserFiles/file/83268591331.pdf
    • http://booklandbooks.com/userfiles/file/kotuwuveduwikutitevodar.pdf
    • http://chaukitchen.com/uploads/files/27324120037.pdf
    • https://pristineleather.com/userfiles/file/71820823002.pdf
    • https://lbk-ingatlan.hu/uploads/file/23717812357.pdf
    • https://resortweeks.pro/userfiles/file/levevuminam.pdf
    • http://haai.org/upload/file/zawikuved.pdf
    • https://kirmatas.com/userfiles/file/82030315841.pdf
    • https://serpavenger.com/ckfinder/userfiles/files/gazuba.pdf
    • http://studioiulianella.it/userfiles/files/13967659165.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ec3b64b66556be41818a8646ed1a1c4c/20567655357.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wogejonakema.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_off0000d3c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 16792 bytes
font_01_sfnt_off0000ebd3.bin
cc6afd6b5183b43b83e2aeaf3b36e8bea79fc40f28164822d508008aa48a525b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 17588 bytes
font_02_sfnt_off0001197a.bin
14d2a1386e8e2b7add4a9b2519125dd961a2804fdf0bdc075257993e47c4da83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 11128 bytes

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