Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9f29f1b2b99ae9…

MALICIOUS

PDF

85.1 KB Created: 2021-09-22 21:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8acc6cef626b2bd2fd128e130a444137 SHA-1: def63aa984700769af71fd397be4d7b221246590 SHA-256: fd9f29f1b2b99ae9e137a0e67da376cc97a65403114f1ce110bcc8cf1faf2a1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious sites, consistent with phishing or malware delivery. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hondaotohaiphong.vn/upload/files/fizuwanowawiloboporewanok.pdf In PDF document text
    • http://ladyvenus.it/userfiles/files/48104407592.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/83146414040.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/witezejonujezu.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/44597454873.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/sezukurefod.pdfIn PDF document text
    • https://wecareprogram.org/images/file/40766550266.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/etklg4749lb71ii13fgbcn7390/37880284944.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/48203142145.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/68187621949.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/48317977528.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/30179886571.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/38257879167.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210913_195909.pdfIn PDF document text
    • http://master-vin.ru/files/file/29386451104.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/68888772918.pdfIn PDF document text
    • http://didopack.com/files/nebolunemizu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pekawagalid.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/zabevo.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gifejuzepenekumizul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=troll+face+quest+video+games+mod+apkPDF 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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 11224 bytes
SHA-256: 32380600c4432b39884e35caa26662136da3bf69fdce671a9a73854eab4df3fe
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 18024 bytes
SHA-256: 5d261818245d53bacea7ea3ea6310f6fae7c7b9defa129cfddeb55a5a5df183f

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