Malicious PDF — malware analysis report

Static analysis result for SHA-256 e640c271e3f66d99…

MALICIOUS

PDF

101.6 KB Created: 2021-10-06 07:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd557fa89813806f3bb70025533575aa SHA-1: 3d8b94fa9aac7aab70eb91cb134a6086213952b3 SHA-256: e640c271e3f66d997f6629373c9db4d97400271754791bb2f271f5118856204e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is often used to obfuscate malicious content or redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection further confirms its malicious nature, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4606

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 https://stradatextiles.com/upload/ckfinder/files/zefiwinunoruz.pdf In PDF document text
    • http://123podkrovie.sk/editor_uploads/files/5181740738.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/pigapelifufavexosito.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/manezegabegebaxaretesuzi.pdfIn PDF document text
    • http://chapelguild.com/images/usr/98429281624.pdfIn PDF document text
    • http://gnox.vn/upload/files/65608975193.pdfIn PDF document text
    • http://tcihk.com/userfiles/85833495589.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/roxuvulewif.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/8634170215.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/81048955801.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kimobufiwobem.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/85669346154.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/54720437975.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/94713245506.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/tojetelateburenasopo.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/39242289684.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qtuu5knumau1q1f567g4jjsm0/34348303404.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/51995959492.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c35ef1003---31150183303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hecate+the+triple+goddessPDF link annotation
    • 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_off00015b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17320 10680 bytes
SHA-256: 1c8b945f348dc7fedd90db4bfbe546e751dc7c3fec1c1cbd46773614a03382a0

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