Malicious PDF — malware analysis report

Static analysis result for SHA-256 a174ee6ee8c38476…

MALICIOUS

PDF

91.6 KB Created: 2021-09-12 20:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0af01c0e12c272fdb6dae6e4bd9d1cbd SHA-1: 76e1864b47a3c11616b4515562f394f1402ae495 SHA-256: a174ee6ee8c38476905f8e6a35aebbbcf808e47871beb9297bf231515fab142e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tulga.ru/editor/files/fetezuropeku.pdf In PDF document text
    • https://inarsindbari.org/uploads/52558077846.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210901_2CD079FF8205F0DC.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/25441390352.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/11803103720.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130340940e80---luwideworebo.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109012159001683.pdfIn PDF document text
    • http://kag.fr/userfiles/file/xamidezolu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bf4cc89491b1e108b16e0ab32596408e/34807227042.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/watetifofobekabuwunomuz.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/tiwunotenutev.pdfIn PDF document text
    • http://accronline.com/userfiles/file/jutabamelagafuzemev.pdfIn PDF document text
    • http://proart.by/media/file/53935362772.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/midafegosoxij.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/31288070013.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/74124199959.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/94928597113.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210904203137.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nutukolizabamen.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/52409706546.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gelelujupu.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///kajavosiranu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=after+2+full+movie+2020+onlinePDF 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_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 10436 bytes
SHA-256: 97f7de195783165ac7fc4b9c107182bada6a41337572f41a4528bde504ddeeab
font_01_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 17456 bytes
SHA-256: b02a1397fc94cad8a87675020b3e1e6ab3622d853a07caaa33bbb3d9a10b7faf
font_02_sfnt_off00014839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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