Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5251e1bf95484f2…

MALICIOUS

PDF

87.0 KB Created: 2021-09-21 17:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2951c7d46396e6d71a6f12abe218d87f SHA-1: b220a7dfc98b8cc134186b97ee29bd21e5a0ccba SHA-256: e5251e1bf95484f25d0e34451e487f0542131bd917eb8f05f35eaf7866f563e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=android+wireless+display PDF link annotation
    • https://vargyasnekonyveles.hu/kepek/other/file/pofidodibizemuxozik.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/61442304698.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/diwiwaza.pdfIn PDF document text
    • http://tyextractor.com/d/files/71679056563.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210921111718.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/rabawatubuxivomebap.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/devininakadamogowinekuji.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/86199379096.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/bujolatadeke.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/72035553049.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/sagazumupafafeb.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/68461595231.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/pepodoporuwer.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/46089148562.pdfIn PDF document text
    • http://ccshecea.org/upload/files/domujerosorodus.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/20291874041.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0541cbe24---kojagemuduberuruwafovijo.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/wosimiwowova.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/38820455588.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/59118233653.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/87249676977.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_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 10468 bytes
SHA-256: 3da388e57b039618d292b7677127de79eeb4823d92efa18ebd3c82a2d6755a4f
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 18512 bytes
SHA-256: f43593918d5bd1f76cf8e87f65f0ddfb5059134b561f4f4fdd79ed0e4e1e136d
font_02_sfnt_off0001363d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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