Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71d1e6705081c98…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 17:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fb287de3057a50150379b8aa9a26aec SHA-1: 97b39c8a533a0c7faf5f3b9271648f44a2589f92 SHA-256: a71d1e6705081c98cef1972cea79434abefd2b08572bb2a52cc426d660143d90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=how+to+play+your+pc+games+on+your+phone PDF link annotation
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/nadil.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210919054748.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/36453478812.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/rexemab.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/45344267681.pdfIn PDF document text
    • http://mp-journal.com/media/file/65550640216.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/kazenuti.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/78365880383.pdfIn PDF document text
    • http://clingac.es/d/files/54471576254.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144c9af56bd0---91848923096.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/wimujexal.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/rojunapimakalalumimep.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/pogusufevovafoxirejor.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/68674957106.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210905_6C8353F2FEDBD149.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/57537592244.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/38811463802.pdfIn PDF document text
    • https://fishuntpesca.it/file/33996442925.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/65628156241.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/zidamujegijujule.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/wusaxujubepuvidubojugap.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/ruwarilovasos.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/lidezunowupuzobawume.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/70481056544.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/dadag.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_off0000b003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB003 15204 bytes
SHA-256: b88dee36ac6d82ed5eb57458e8231e243f5c62781b166b73931b71dc9483a060
font_01_sfnt_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 11020 bytes
SHA-256: 3fd456018d7353eb7e6461d90356686c168cbc8b682ae2edcc157afc4e4a2ccc

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