Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ed4c30333bf385…

MALICIOUS

PDF

90.1 KB Created: 2021-10-06 23:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 255dfc96f02829aa142b79e0f9888efa SHA-1: 1cbf8cb955422c85ad152f5ed8745b72ad6a1e97 SHA-256: 27ed4c30333bf38531a67b68efac408c8b723982670f031147f3848fb2050178
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs pointing to a link farm hosted on disposable domains. The ClamAV detection and the heuristic identifying it as a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3901

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.
  • 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
  • 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://spokoino.ru/i/upload/files/53119548808.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fde88b3818---gojegaza.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202110042110464706.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/32357307474.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/vonen.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/toxadegifuxegodaza.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/25952994318.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/55706267359.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/jobuterusivigufowiwakigok.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/piwutobutamanatokixa.pdfIn PDF document text
    • https://dafelia.com/files/wikubumexara.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/76636942647.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/58262365001.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/vesipaxiradukuxokezeperav.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/vawufadutazazulomatawujaj.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/pilipenuro.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/motubuwigaxoxiwi.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/27154637736.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/20117562233.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/gikezobepaxi.pdfIn PDF document text
    • http://kgmda.com/upload/files/61854910027.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/803aeff7cece879b491837ec2558508d/33972833264.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/16879166427.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/10870940219.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kafapitinuwexebedafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=folate+good+forPDF link annotation
    • 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_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 10144 bytes
SHA-256: 34228ed310de44a6b8a0258a5c7be5c9f7dfd770e10c994adb9aeddfa1f04892
font_01_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 19780 bytes
SHA-256: e20e104d699befb2ba648211ad058a97bb8af915e83e174edf5b11a4a2460a48
font_02_sfnt_off0001528b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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