Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bb3825bf1b3040…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 17:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85245ad77e90d8ae9e60a2a38cf686fe SHA-1: 53c98d3f2e3204a7057eea00a302e412f2273255 SHA-256: f5bb3825bf1b30402124be0b338e7607a337e74580aa44c78d7c9eed6076b409
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a probable attempt to manipulate search engine results or redirect users to malicious content. The authoring application 'wkhtmltopdf' suggests it might be a generated document, possibly for spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bisnismedsos.com/userfiles/file/97582175218.pdf In PDF document text
    • https://panama4d.com/contents/files/43726163409.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/denalimijuvaki.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/golifawuvupefojupikofukoz.pdfIn PDF document text
    • http://st03.it/userfiles/files/93576661139.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/govanujuzibukugam.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/fulimenavozedi.pdfIn PDF document text
    • https://abss.pt/userfiles/file/fogenufovuxax.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/sosazinujugunot.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/61823892510.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/30039515421.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/19346731189.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/dakalenekidupew.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39d7432dbe420f5ca07038ff8f093b65/pitetap.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/49647915152.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b1f01e7b---30330073735.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/bekuril.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/bepetepijat.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/49783581130.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/beton.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/76570618863.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/98288274874.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/17682686122.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/mezusinezab.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/12239305425.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/worejazivodalab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=manual+de+biomagnetismo+holistico+pdfPDF link annotation
    • 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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 19496 bytes
SHA-256: 41925223db96ab84f1f93fcaf4b5f503c8582004fbada02eead776e0994efdf6
font_01_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 11200 bytes
SHA-256: eed1ec2dc0e224e0782aef200c0a1f972082c3c8be9e646ee9c50f0a9de89d0c