Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3dea3c2815ed9f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 17:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 153b8fc134f3c1b774f92382be593f0d SHA-1: 0a71c535448e03f33d2a1dd8d14247c68fc4de27 SHA-256: dc3dea3c2815ed9f2c561adefa592d6715d7f6011379bd94491b309581c9536f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' directly supports this, suggesting the PDF's primary purpose is to host these redirects. No scripts were extracted, but the PDF structure itself is weaponized to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irlanc.ru/uplcv?utm_term=english+grammar+in+kannada+pdf PDF link annotation
    • http://gibisch.org/files/files/39984369620.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/giwiwesakoximiladunijo.pdfIn PDF document text
    • https://mattress-leader.com/media/geludotikekipovoxogupaxuw.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/wiwokuje.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/raxazoweb.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/1432444021.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/wotutupik.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/79837604247.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/10882830190.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/tobemuj.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a53148c7f1638befc09914ce2b0ac046/pujotopaxogeji.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/98530519606.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/likoma.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614294703e8c0---65186731874.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/ziparorenitideweverob.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/tatigekimapin.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/87203787477.pdfIn PDF document text
    • https://alutat.com/data/file/30702142793.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/gajar.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/zijefefi.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/veriw.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/18201057498.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/34076309096.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/50651125388.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/73151652905.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_off0000c7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 17544 bytes
SHA-256: 799e531e48f4241a55298345eacd551cfc3e98b1cf2bdc23e3b25a29744cfd60
font_02_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 10672 bytes
SHA-256: 501c29810cd5226adab2826473b431495c950f0736b777a4e5e828c1faaeb8e6