Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a671c6ffb60015…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 12:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c61820d034d7adf976b36c6658c010e8 SHA-1: a431052bb75624ec92837c7cc9f72875b5471241 SHA-256: f5a671c6ffb600152db3a634567d2e880f71f77acfd5cd95e1c597adbf9de939
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, exhibiting characteristics of a link farm with numerous external URLs pointing to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and redirectors, suggesting an attempt to obscure the final malicious destination. The presence of many unknown reputation URLs reinforces the suspicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://abnig.friendship-match.com/upload/files/52551891753.pdf In PDF document text
    • https://ctners.com/ckfinder/userfiles/files/47050925018.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/23566783859.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/dalonolivepopasil.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/sororeresileberafizezivu.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/48732982029.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109011948434240.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wubejiguxenikotixonora.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/watupapunajuradavurekadul.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/rufol.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/43370191332.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/nevegefipimovabezoduped.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/vulerimoverunavo.pdfIn PDF document text
    • https://jss-moms.si/upload/File/96125270690.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/vivam.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/fisubovopedejerotuforep.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/xexewuresi.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210908005255.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/70388291509.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/bosegasivomopa.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/87464938185.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/kupagubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=boom+beach+mod+apk+private+server+2020PDF 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_off0000d165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD165 17316 bytes
SHA-256: b2c9d3e82fdda4d20f562de49f968104beafd014dc47d4cdb0b5816fdd95058c
font_01_sfnt_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 11224 bytes
SHA-256: 903490eaff1ae8a205eb2d48c060aab65055bf4f34245d3a51715f7834f10a9b
font_02_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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