Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6b124b1ef37106…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 12:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a162d7f13d777002236783263276a7c0 SHA-1: 7906183febc3ac872ab1fb7dea93d6a5975e799c SHA-256: 9f6b124b1ef37106d81a2ed0422b2b967e4fef0cc3df4b8159cf3179659cdd2a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a social engineering tactic, specifically a browser extension or update installation lure, to trick users into compromising their systems. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the embedded URLs suggest the document is part of a phishing or malware distribution chain, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=frascati+manual+download PDF link annotation
    • http://alotercuman.com/ckfinder/userfiles/files/75738963700.pdfIn PDF document text
    • http://sireny.net/share/files/pamafojaginefipuvurelilen.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0c5c92f4---xidarituwox.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6135c2ce21a83.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/76905090583.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/bebepujivuxubi.pdfIn PDF document text
    • http://duef.ru/public/file/derudivukupedipazitek.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/loridigesanub.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/7925612203.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202108312014495385.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/defazikeva.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/kijezemolufufej.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/12792428584.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/13712873503.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109062114176665.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/99936972568.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210905004916.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/7956443614.pdfIn PDF document text
    • http://plncse.hu/php_data/file/weguxawezodategifuzelur.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/84947129224.pdfIn PDF document text
    • http://anpharma.net/upload/files/17328860228.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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 18164 bytes
SHA-256: 0c2c9e5741194fecc7253eeea20622b9170fda4e6f622ef1f036d3810bad7582
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 10564 bytes
SHA-256: d6e5f0d0ae7392da135af78ea496f086afa49ba7ccc4b8038e6606d14685e357

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