Malicious PDF — malware analysis report

Static analysis result for SHA-256 843d164df3afd56c…

MALICIOUS

PDF

78.4 KB Created: 2021-10-07 06:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed79dc796c1ca4d52cc11b6973d905b2 SHA-1: fba477e301c3584b94933e317add79917a7b03e3 SHA-256: 843d164df3afd56cbca87a52ed2addeb115438874be0668e1aaecd214d608ecc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high concentration of links on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://yesilkoyluleriz.biz/resimler/files/xuganuvulugusutisabekod.pdf In PDF document text
    • http://lollanaclinic.com/image/upload/File/38753592251.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/nodanedaraxakuxam.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/38134429311.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/74743611153.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zamire.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/wadujilalilisi.pdfIn PDF document text
    • http://dakmet.pl/upload/jarozoxeviwo.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/7894382577.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/nuxejok.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/bebove.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2e4fc95d5d88e55623dde10c19ea0ba2/39846790141.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/lodewiziw.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/51669109534.pdfIn PDF document text
    • http://jar-ted.pl/file/dofuguwuxubebofep.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210911175659.pdfIn PDF document text
    • http://okvin.org/userfiles/file/65684598131.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/99385030693.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/98558600937.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/jivijokuniseliwubipapi.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/99819387417.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/14874535176.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/netugap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=injunction+in+administrative+lawPDF 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_off0000c9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DD 10864 bytes
SHA-256: 8b72a8a7255fd87a6de8a17ad28ee108a7ba6f3c05354af1feb713ed87432ea7
font_01_sfnt_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 18916 bytes
SHA-256: 660b9ef1a1a6462d08678359ebad4221f3e6ed8a07ba913a8dc700d9f05692c6
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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