Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd31532735eaa5ae…

MALICIOUS

PDF

54.6 KB Created: 2021-09-26 00:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18150f82c924a5d7196d75d1d42325c7 SHA-1: 981cc0f1e4eab0f59c75fe153058d33d74aca607 SHA-256: dd31532735eaa5ae1e725715cae285b049749089cdf76bb40def5042fef71af3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a tactic to obscure the ultimate destination or spread malicious links across multiple disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8104

Heuristics 4

  • 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
  • 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://ketchas.ru/uplcv?utm_term=viola+app+apk PDF link annotation
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/pulajaxexekudowekegud.pdfIn PDF document text
    • https://hsse.cl/files/49649858663.pdfIn PDF document text
    • https://cape-electronics.com/media/file/lupagoperupajeme.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/77808305669.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210917063117_pvadt1.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/34726857447.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341da8d4117---xonujazuxovi.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/84395271649.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/zubijubomarakix.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210924101231.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/lalafivafosu.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/kosenatuxetewafevatuluzan.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109020727499192.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/jofefujazavevoxido.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/96121247851.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/budanikofagotubiganukom.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/pavefifofonetinut.pdfIn PDF document text
    • http://redactron.com/userfiles/file/37154398622.pdfIn PDF document text
    • http://hueide.com/upload/files/73173441325.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/af5dbf631ee08c53a2bf1c4ca96d021d/soratofogapasit.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210926_0F2390A7427D94BE.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/59270518110.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/meworubelarizafuzebux.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/38961024822.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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