Malicious PDF — malware analysis report

Static analysis result for SHA-256 5291371639ff210d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 00:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5bf85d0cfe3d2c0f8d0d0e926ec5dbef SHA-1: 9206dc5078056642d6c1f191bf71760482c574b9 SHA-256: 5291371639ff210d8a8fb6585128fc98ec51d0b3c7f635e7f43772c89c3e6725
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it is likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=how+to+delete+games+on+my+phone PDF link annotation
    • http://tmacfashion.com/ckfinder/userfiles/files/sudavomi.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/40077038440.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/lebufuliwuvulotixafom.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/40952894165.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/14810021937.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/mexikuwejofefunoxesugar.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/75783512243.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458c2290a02---28623026869.pdfIn PDF document text
    • http://topflexsports.com/uploads/91538059029.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/22529710310.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/silekuvo.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/74428082641.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/bifigejax.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_073035.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/bilubalisotujufasipamibok.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/43711179021.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/kijaxovivavalude.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/63348914537.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/95832017252.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/fadasuwopudan.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/gigadagowakudogeve.pdfIn PDF document text
    • http://ux-school.ru/files/files/dujobugakafedawogibom.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_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 17556 bytes
SHA-256: 470edd9ca87bfb4848ba64f0161ef28f3b184111420b1c40010248fca1ceacba
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 10836 bytes
SHA-256: 980b6fc7f0214db926cbbd0a6ddc8b27a44e0d5dcdde2ad161533a44c1bd0bfc

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