Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dbaaa55ab43079…

MALICIOUS

PDF

65.2 KB Created: 2021-09-29 12:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0732a5f345ad92557158f3663a373657 SHA-1: 34e42feca23e011bf6d7ac083b57c1b298c7e44c SHA-256: d8dbaaa55ab430799d6935aa6f736e37eb0fbeabf93f05dd296e848ea2334973
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8461

Heuristics 4

  • 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
  • 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://infrive.ru/uplcv?utm_term=how+do+you+check+your+voicemail+on+your+phone PDF link annotation
    • https://kingdom.vn/userfiles/file/67837298085.pdfIn PDF document text
    • http://arucax.am/user_images/file/vebosagopigikimiwanufaw.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/72886235177.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/galanebivamebumogotivu.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/madamoviw.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/91911881729.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/88634674016.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/39212033905.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/48712819259.pdfIn PDF document text
    • http://malifer.hu/upload/file/38960689948.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210912_6ED5137E02D412B0.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/32354533869.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/42984710166.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/3214202325.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/10552875150.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/rolimenovukipim.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16152702f80e0b---mobefefikeku.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/bevup.pdfIn PDF document text
    • https://renewone.de/files/fasedugonubipaxewami.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/63199039076.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/37549720690.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/37857089614.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB952 19704 bytes
SHA-256: eb8cb4e8de97f1df5d9f9e9a32a527e4b4428be29441874b8ba240224bcb8a67
font_01_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 10964 bytes
SHA-256: c0af1924bb468dca77d360fa48037d5c5f795693cf5acf0c35a0164ab4684cf8

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