Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7cc7ba9e8d54f7…

MALICIOUS

PDF

76.6 KB Created: 2021-09-13 22:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3c883e464d07386f38f959804c7277e SHA-1: 5681286b084dcc9fdf8fbec9c69fe74a8caf61ba SHA-256: db7cc7ba9e8d54f75aca6fe04a1458a5049d23f0c901ca2e09738b3ee5a15998
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, likely intended to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic suggest an attack pattern focused on directing users to external malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=bar+chart+with+two+variables
    • http://sydjpg.com/images/upload/file/20210914_002705_156.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dikawako.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/87361843447.pdf
    • http://uniradioweb.info/userfiles/file/59947394389.pdf
    • http://abwcrainhwy.com/uploads/files/vujox.pdf
    • http://tvsatkrosno.pl/userfiles/file/89261316162.pdf
    • http://alanaf.ru/userfiles/files/timekimuzidojegumopolipor.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/xatejumaromipe.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/vagubakifitonuxitide.pdf
    • http://studiotecnicobonoli.com/userfiles/files/ferolasor.pdf
    • http://ychnjl.net/userfiles/files/liwinalufubegexob.pdf
    • http://chronocertif.com/userfiles/file/womoref.pdf
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/74942503708.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/96757910652.pdf
    • http://sk-uralstroy.ru/uploads/files/78204511377.pdf
    • http://primaria-ciocirlia.ro/media/file/pewezezupatowo.pdf
    • http://gokea.org/upload/editor/files/kujeduzolojalavujugod.pdf
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/jexupilonixa.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/358a668fb4613355a8dbc63001bc3fd5/sewojetejalibatevamoni.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wanavajofupuzemexabizevef.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/sixatojuko.pdf
    • https://quangcaowebsite.vn/uploads/files/nepegeneviju.pdf
    • https://petrovsky14.ru/docs/files/32145852057.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 16792 bytes
font_01_sfnt_off0000ddfb.bin
f2637537e477a68b976113fd3ebf1451ee7f30ea4e6c92c26eb9a7072c31640b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 10568 bytes
font_02_sfnt_off0000f65b.bin
c0fd3e9838b24920646accbd87e7ac318ad8bdd0568286b78b5ced1baa62a8d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 17760 bytes

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