Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f777c3ad97a4a0a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 19:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2532a864363db05a42c3c2bfb3761ce SHA-1: e021d99edfa38b95c98c37d6ced004a6cce96dab SHA-256: 1f777c3ad97a4a0a1e4f6da3d514f3056428f73de7e32f4fa7e7cf453c3dd2a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs pointing to various domains, suggesting it functions as a link farm or redirection mechanism to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=aplicaciones+para+ver+anime+en+android+gratis
    • https://habibitoursegypt.com/ckfinder/userfiles/files/42209595670.pdf
    • http://cameranichietsu.com/luutru/files/80296048566.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/zogovapifegusazira.pdf
    • http://quesnelfoundation.ca/userfiles/file/dijiluxitadodami.pdf
    • http://wefocusdesign.com/upload/files/vesilomaza.pdf
    • http://aceonlinementors.com/userfiles/file/tijojojetijevilusugoluv.pdf
    • http://www.pattyn360.com/upload/forum/files/woroxosebotovabonefir.pdf
    • http://vistobrasil.net/uploads/file/10369133321.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/lifikugepilixomuj.pdf
    • http://pappteam.hu/userfiles/file/tebonedopugofeti.pdf
    • https://wangwangcamp.com/uploads/files/202109060607003249.pdf
    • https://franciscovalles.comtraining.cl/userfiles/files/88120485044.pdf
    • https://candica.pl/ckfinder/userfiles/files/48208276301.pdf
    • http://sushikyototogo.com/uploads/files/pupiwekefelagakav.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/54856147152.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/16430222681.pdf
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/4639023127.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/80307325622.pdf
    • http://hndgyl.com/v15/Upload/file/2021961946233490.pdf
    • https://synersys.fr/contenu/file/tenokujurejutovidavola.pdf
    • https://faktxeber.ru/resimler/files/veniwawuxoxagujuj.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f62c1b36baf807dac665dbb036b6e7b3/46178874983.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/nefoku.pdf
    • http://odpadykj.cz/UserFiles/File/95398066350.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_off0000d373.bin
ddf324ead4b72e640b97e5a2ebe339848ac1b1c370df82cf3c0f0dbc054834ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 18184 bytes
font_01_sfnt_off00010193.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 16792 bytes
font_02_sfnt_off000119aa.bin
0f4b1dc052ca36337352a4c4e39ec4fb9a4e2c5b2ddfc5a61a78ff47d55ae49f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 10904 bytes

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