Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfa063f76d76b3d…

MALICIOUS

PDF

67.5 KB Created: 2021-09-20 14:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fbbed4416e45e59aa0befff6f352b9d SHA-1: 5660a75e082f286e41539df943c2a6b3c8d4c76a SHA-256: ddfa063f76d76b3d74fd7124498fa3a179511b9e0849e1b90214b4a6b785b61b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure the true destination or spread malicious content across many domains. The embedded URLs, while many are unknown, point towards a link farm strategy, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://standsimulator.com/ckfinder/userfiles/files/80948022923.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a95ac3ec3---timoxiwow.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/95588152482.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/37574406193.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/puvawoxidakazulegenuwa.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/bimefulubusatebibagabidu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a28a78d7e8---30163527290.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/84546867413.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/62737035253.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/93585982339.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/mabisudosuwubami.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/5462918585.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/89682294525.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/52577800244.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/juvisosotumajedexolofewe.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/gobowezokuxamerusinem.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/xodisoxupijesise.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/ditefineginabutikobajegu.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/391381603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=apk+in+flutterPDF 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_off0000acd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD4 10072 bytes
SHA-256: ab7e49f2cb7556cb01824c7c45d5c33d9767aefe00ab7339466dd6a58df9f754
font_01_sfnt_off0000c35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35A 15128 bytes
SHA-256: 20d56e7609794bafea019e60c10962ddaa9566eaaff34e2aa3017bb5433f2e01
font_02_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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