Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f3cff654965f31…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 18:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 645dd7d4eba84e9a79ba0d86d8eec23f SHA-1: 0fb6150869d804a50d23e79f86fac8906d8e30ac SHA-256: e4f3cff654965f31bcaeec8a8a7bf6882718f3b277d2aa2f211eb24f5d171b0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external URIs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=free+fortnite+skins+website+no+human+verification PDF link annotation
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d62dd4a36b82555b405d9e365a8de3ba/92314198834.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/rijemegobaguziwiwosusuji.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/fewak.pdfIn PDF document text
    • http://mweb.cz/images/file/putenizigajugekenisumu.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/31920663815.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/96616076078.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/sisabuxesiwojukedube.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/ganiditomolebixoso.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/18552996165.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/zivujisupitikotoluk.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9d2d714e---nizezazopo.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/tawus.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/zelimoluzelu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/4230313863.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/visupenobuzupoveja.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/kobivuwa.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/pizokir.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/46611130235.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/97169077963.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/kenufirunumik.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/54095227358.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/nemorulevubaviki.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_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 11016 bytes
SHA-256: d31f3d3863a0c96d225117d686b0fb2cd38b21a88363b39456c80a79568be803
font_01_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 17072 bytes
SHA-256: 908b279308722711ed1ec367215ac0f745093e8251186f5932a9440e57ad6e99

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