Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df3f1b80a9b0fbe…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 16:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4024432e4829f75ddaa76b3fee5d7b26 SHA-1: 8598fc15861735c2a47051570e73096533864fad SHA-256: 4df3f1b80a9b0fbe9863e37324bd9e27a748aabd796aa1dd2edc4a74353a2e40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pass-eco-energies.com/ckfinder/userfiles/files/25932800093.pdf In PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezunefeduwuxom.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/92312157163.pdfIn PDF document text
    • http://brlairport.com/images/file/24926031677.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/dakarafudejabimozif.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/fosifosumuxodisufunelivif.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/95403126325.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/27766504495.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/90093709389.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/85097540756.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/leradaxetofiruzurodimozur.pdfIn PDF document text
    • http://steinemann-ag.ru/40679304235.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/79831868773.pdfIn PDF document text
    • https://jin-ji.com/upload/files/nepuwadikog.pdfIn PDF document text
    • http://rsentco.com/upload/file/22688507882.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760d38e5cd---17647743592.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/22531538679.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/74490307456.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/25960624224.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/9555666382.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/34384296645.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/ganudobezapevu.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/36260321801.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/38138201795.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/50391865535.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/75518493492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=street+fighter+2+apk+full+versionPDF 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_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 17868 bytes
SHA-256: f5f7b97df27e61a37380fbe03d187e4ecfd35f91b6016954064c3a193e10e351
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 11092 bytes
SHA-256: 2ddfe815d485c0ac2cddecc52e2441f00c2fea54807f857bab77f52c56056c0e
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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