Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7d49f3de7f092e…

MALICIOUS

PDF

98.7 KB Created: 2021-10-12 07:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e2be8bf368dc2c280d5070868dd19613 SHA-1: cff0cc0ae3fe50fe0694360ccd43177db8daceda SHA-256: ac7d49f3de7f092ed26e39f51b8665179acecc69bc5e5971743f975baa9e7d5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF acts as a link farm to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://smidgel.ru/uplcv?utm_term=best+cutting+steroid+stack PDF link annotation
    • http://studiotecnicodambra.eu/userfiles/files/kebawotesaroxiropesav.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/54920647200.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/fakavoxo.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/rafogujefofalomiromefimed.pdfIn PDF document text
    • http://nktrading.qa/file/files/ruvogisutofenipadov.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/11859011335.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/37873120750.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202110101851195204.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/zunovuwufoziw.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/devududemirupuvaduxo.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/51696787596.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/bukevifakebeje.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/medusiwoladenofeleni.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/98043658212.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/54839861242.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/fidulalugigin.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/54985556800.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/92486484116.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/zerom.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/taminijiw.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161590432843e0---10220308702.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d3bef8fa7a74733069f9e800704c92b3/24203356420.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/20892722291.pdfIn PDF document text
    • http://sin-hua.org/userfiles/nufuwafojazu.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/tovarivonozego.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/durisavabasobu.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090209160673499.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_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 20032 bytes
SHA-256: 19912e5a44ca9a8e4dc260cf4b451c0f2a341374d180f9e149c6bac77cc0fc46
font_01_sfnt_off00014bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EC 10744 bytes
SHA-256: 087916e12e0c2af507296f26c6ef66c23e4a8c1fa3bea8d57924601a72e4b2d6