Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d921cc7f417ac4e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 20:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f59ee9faca50501d8bc5c24440bd795 SHA-1: 0e2ae08a1c716d56bb4d553696ec935002020556 SHA-256: 1d921cc7f417ac4e128b9f99892c592fac533f8ab8f5e367721e329c733b9af6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, indicating a likely attempt to direct users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=n+track+studio+9+pro+apk PDF link annotation
    • http://ferrocom-spb.ru/userfiles/files/64323954632.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/zeguferolitivowuvaje.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kitezeguxe.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/nokovebi.pdfIn PDF document text
    • http://gibisch.org/files/files/14643064194.pdfIn PDF document text
    • http://sinostandards.net/upload/files/xumexeb.pdfIn PDF document text
    • http://iphysiology.ru/upload/kekide.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9884b57f6---6046413240.pdfIn PDF document text
    • http://sbcnepal.com/images/file/91200580079.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/fusugutedolinetawot.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/50653785209.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/56326279648.pdfIn PDF document text
    • https://2acontractor.it/images/file/69960070038.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/6162892346.pdfIn PDF document text
    • https://fond.ru/userfiles/file/67812383477.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/rosonedukirekibu.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/jukure.pdfIn PDF document text
    • http://le383.com/uploads/files/80850831466.pdfIn PDF document text
    • http://unityproductions.com/upload/files/31654974373.pdfIn PDF document text
    • http://pedraferro.com/files/files/telipat.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/tinezumosefovojamox.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/sazarajubudubivogis.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/nebenilijosegasofuget.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/18327192348.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_off0000b6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6ED 10560 bytes
SHA-256: beb18d7f2bb946ddfa6f6d9833a3911a86c8ebc6b58005a36d739938b5fc941b
font_01_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 17388 bytes
SHA-256: 6ab6c7fd91541022576bc5cbb578cae6fc6d4821216127775184781bd173a846

Open this report in the interactive analyzer, or submit your own file for analysis.