Malicious PDF — malware analysis report

Static analysis result for SHA-256 963741a8d4e2e41c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 11:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c301c7a00e1b53aaef61a44644b104e SHA-1: b0155421466e1b97da422765710ee85f01abaf01 SHA-256: 963741a8d4e2e41c6bbec56db210ff1256ee005aca9b0cd1d512bc9814a1005e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, forming a link farm, and includes a heuristic for a visual download button lure. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=hack+wifi+login+page+android PDF link annotation
    • https://k31szmq42-nu28.com/contents/files/rubak.pdfIn PDF document text
    • https://tomas-music.com/contents/files/dofovuzixutozid.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/7799182145.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/xijewipegetunux.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/69801824702.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/pafujegejeg.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5aa3c38d---56856954504.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/lazetebesizurixirubedul.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/54690123718.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/88398077658.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/bibusujizunabakibugewa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/84331964011.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109110914052288.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/zirakofabidusamosamazusa.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/nizilifuwipuwemuka.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/25442374323.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/8569480452.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138799c4a2b7---27694568102.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/zologopumovosopu.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/wosotefisatudisofu.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314581919287.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_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 17296 bytes
SHA-256: 0836b6a01664ba34cddd9e55159feef8502b12a1988037d7d6d79672199f28cc
font_02_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 10696 bytes
SHA-256: 8315358418cba087a14f62ba10a67ae7ee1731088348f3f55dc89bccc3884655

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