Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e219040c07a8d2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 16:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc6986d78984fc046afed5ec36ee6374 SHA-1: ca0cc689dc4e4f6a995d82b249941d273dfd493e SHA-256: 69e219040c07a8d28346ed397a9c7b351bf57e43e100daaf8a2497ab373dd7fd
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a specific rule for link farms on disposable hosting, and a critical ClamAV detection. The presence of numerous embedded URLs, many pointing to potentially compromised or malicious domains, strongly suggests an attempt to redirect users to malicious content. The ML classifier also returned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gk-eventus.ru/admin/ckfinder/userfiles/files/lesedatavubikidavaf.pdf In PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/xulonaj.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/24995845565.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/kudavodapokerus.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/totarilunamevilusimonur.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/21515183997.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/42346247515.pdfIn PDF document text
    • https://allianztc.ro/files/file/zerazofibaduselemeturovo.pdfIn PDF document text
    • https://kultmotor.hu/images/files/suwabikebuwetolaxalo.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/91451426520.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/97155770671.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kukubagevigez.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/saguxinibemuxa.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/jetuzifujeniwiwoneja.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/domejepatataxulas.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109131119103579.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/24446547875.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/31198778775.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161400ae8f1b3e---37176683234.pdfIn PDF document text
    • https://sadex.pl/fck/file/36351777703.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ea98a51c---83258880605.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/loxegovimatadit.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/51129338836.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/wipixozege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=this+app+was+made+for+an+older+version+of+androidPDF 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_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 17368 bytes
SHA-256: ab221a9bb1f9f10b68f69ba64d00ab41cf7b25082d40d2f748873bc4a76ec25d
font_01_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 10780 bytes
SHA-256: cee9187b71dd459e81e6beb229b341f1068743691a09e3fca7eee5ca29057746