Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3494349f1448e65…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 21:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5de84894fdba4cee4c24a17744361057 SHA-1: c82de9831968f2abd092e29f998f5b7d604752a6 SHA-256: b3494349f1448e65c55f67211f2f59491f7d779e239116f8624a4af67f70ce46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kahounova.cz/userfiles/file/67099023726.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96bb30373.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/96948415264.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/56417181573.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/kejibegojevuritegekevep.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/xorugitoraketifivoj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be69762c5b---mobixegasufoputixosel.pdfIn PDF document text
    • https://equimat-cheval.fr/file/94964226521.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/59879959391.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/85019718823.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pumemawotitinidaxexupob.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/5243620454.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/lujiseperenilol.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_1279A9F81DA282DE.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/44388303393.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/30764530943.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/xuwop.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/34557783247.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/rujevuwil.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/55950959414.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/25495123683.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/vipevakez.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/19448287571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+hibernate+modePDF 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_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 10420 bytes
SHA-256: d24bfa6411c6e9e3a655fd0f8f9e571056b544f68ce239fff00575895b4f64c3
font_02_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 19492 bytes
SHA-256: d8a6a2933605ff3e0655db8708a6a5eab6b48acf5d0d1a956987272fd3e1c549