Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca573f5205477aca…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 16:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff9d31cc101891a96c0a913870fdc3a4 SHA-1: e0517965f8fb1761add7781b758003a0984d76aa SHA-256: ca573f5205477acae89389dffc3d4e19b00906491c5cdaae97b53cf6a82560a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=fast+and+furious+9+download+free PDF link annotation
    • http://clearspace-design.com/CKEdit/upload/files/11432965144.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/xavirokotudifudibelarefar.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/72520179542.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/21448972775.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/28917036745.pdfIn PDF document text
    • http://inistor.com/ufiles/files/22179391303.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6460c69b---fosilawo.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210901041304536476tjsggh.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/81352392582.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613150d83c1b5---gipiteluwoputobegiludaj.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tivoridikuwajidape.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/17599237793.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tujebozumuzegevenaradizo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/64797809218.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/gosuwepi.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/vefaxizobu.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/riwanubipudufemubuzufod.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_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 17504 bytes
SHA-256: 7c9d35418ed77f5b1def861f37912e36cd506582ee959dbe6087a5a40c688646
font_02_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10676 bytes
SHA-256: 50e390f0745272af259bcfc50bbef070fb5b540b577dfb48fab6efff8d5a0b58

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