Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45cec8b58b82bc0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 04:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7636a601bbacba172a6b92478ffd4dd1 SHA-1: 543951edc76b7d19e4396f2ca2640212cbe28315 SHA-256: b45cec8b58b82bc01fce2015f583c728211057acab0ef2734b03260b51af7faa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, containing numerous embedded URIs pointing to disposable domains, suggesting an attempt to direct users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=apk+fgo+jp PDF link annotation
    • http://generoussecurity.com/uploads/90254014947.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/14156220348.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/dogumibidesem.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/31311213820.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/tafoke.pdfIn PDF document text
    • https://go2germany.ru/files/file/gefujokudigemegafub.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/31714650762.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/40729037660.pdfIn PDF document text
    • https://t2sc.me/userfiles/karusuvoxizejozoraba.pdfIn PDF document text
    • http://forti.in/userfiles/file/5544995396.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/dufukujurap.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/45917152671.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5db6bee82---56649228520.pdfIn PDF document text
    • http://nessium.net/userfiles/file/wubixakativ.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/2022139926.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/lududuxokekun.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/raxiduvotikuzasikivux.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/fatox.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/79741701393.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/5941089847.pdfIn PDF document text
    • https://seikai.jp/free_images/files/junowubovisikiweburof.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lopikapanumenuxolimigev.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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 22236 bytes
SHA-256: c9fcbb08ce8f76e2aef11b854a0da456530473114c3c1b82e1274f10c693038f
font_01_sfnt_off000112bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 9832 bytes
SHA-256: 56ede4de0e90a98b9b5af75d3de9231908fc8c353ae11b2b6c89df0c04c42fa9