Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc4d651432719f4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 00:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c341a681c10802c3cbd86485d4d2e471 SHA-1: 9d983292cdaa7c3b165e254f44cd36f9ab1e688f SHA-256: 9fc4d651432719f46807799e8648d3bf9f41d42673f10a902beb245a295054e4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded within the document, suggesting an attempt to redirect users to potentially harmful sites. The presence of many distinct hosts and disposable links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://profipreklady.cz/www/ckfinder/userfiles/files/39793287463.pdf In PDF document text
    • http://obkladlazby.cz/userfiles/file/nibudijusuzu.pdfIn PDF document text
    • http://billsky.ee/files/file/1506463188.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/87780096530.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/27369959128.pdfIn PDF document text
    • http://silver1979.com/upload/file/likuvidizujalabolavo.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/wigevujedinig.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wozedazuwegefe.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/66856703820.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/28565112588.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hgndreru5mhb31g61anmnr9tjc/kawuwevoxu.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/fisazopeperiwevolomew.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/19042492465.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/75957380132.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/7557026228.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/gagibizid.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/28994658468.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/sipad.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/21734651387.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/43629244469.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/poxufapireguzobezi.pdfIn PDF document text
    • https://senfina.top/uploads/files/61723618288.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/moxijibax.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/jiwodarudabesid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=carx+drift+racing+2+modPDF 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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 18696 bytes
SHA-256: 29b5053565b1da9b7da0f6a85b512538b79d1148263d6dfd841ab0f488684ab4
font_01_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 10728 bytes
SHA-256: 512bb130c32f654deee907d5f418bdcc4de6e3931cb669a022b919d3a6a8ca2c

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