Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b5d6a2614b333d…

MALICIOUS

PDF

80.6 KB Created: 2021-10-07 09:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d081328d67dd1e9efab44282d2cc6720 SHA-1: 2bf11b466ff99bcbba932415b2a644c23492cf79 SHA-256: c7b5d6a2614b333df80f8a47e98a10f1e47b502a102e80a4f82ea0eb150116a4
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 indicating phishing and trojan activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous links pointing to PDF files on various domains. This suggests an attempt to obscure the true malicious destination or to distribute a payload through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fresh-cherries.com/ckfinder/userfiles/files/zidovubesokikibafajifi.pdf In PDF document text
    • https://ms01bet.com/contents/files/2802340971.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d8a8652e4cf833b6304be2b97c35abf7/20283886805.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/zefunupekesirazuto.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/lipip.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/bedufibutipewek.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/zutisoverodezevanirabun.pdfIn PDF document text
    • https://www.de5dollarsdigitizing.com/ckeditor-ckfinder-integration/uploads/files/ladov.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/rejamegaxaxikax.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/89420634589.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/54541680620.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/fekunar.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d305a8831---duronuwigem.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/nutaledu.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/31743837044.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0908/b94718ec454cd2c2e549348e94b3b92e.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/9066813376.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20211001_904BFB26956FB194.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/soravamazulopusedad.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/sumozosor.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/nojowovurim.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/47038058455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=come+into+the+holy+of+holies+chordsPDF 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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 20744 bytes
SHA-256: 98fca248f10593c9a8f391d368333e10c91417bfef417adad29f5c28fd19d096
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 10724 bytes
SHA-256: 9ce6e8dfc30aab4dc76295b40aa056effdd0833144494168190d763fcbe60d23
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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