Malicious PDF — malware analysis report

Static analysis result for SHA-256 003c773abb8da644…

MALICIOUS

PDF

66.5 KB Created: 2021-09-29 00:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 17580c82b6fee304d79eb51a5ad02c17 SHA-1: f8c37f25238fcf9b2c8769890a7ff9a2cc5f9d84 SHA-256: 003c773abb8da644ee017716d7e38de7f98ee6aee6d02b0cfb3badef7c423c23
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4107

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://medvor.ru/uplcv?utm_term=narcos+game+android PDF link annotation
    • http://shinaval.ru/userfiles/file/57738796829.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/81661166423.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/98290621198.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/gutolegumivuk.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/7774827481.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/vapibupigideve.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/73449881103.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6cnp79tj37nkbulur8ggt044tv/70829641109.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/47964349632.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/46911982762.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/34079417149.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/98535360188.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/80677402368.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/kutubafuketigatepo.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/89114844737.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/fegulurisazojin.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/desewabexaribowumig.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/sugiguvusalekukemupud.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/68324799826.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/wakezapi.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/xawivixavawipotowarexon.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e016e033ab---pobeji.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/lufusuzefepukojetezugoli.pdfIn 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_off0000ad17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD17 16088 bytes
SHA-256: ee983568e47a8493fb243786ef31c0a6256f4bc976bce7bfd8da575663515af6
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10548 bytes
SHA-256: dba3b7b045a034f51c508a86013b4fc6f50aa180be57fe6de1a9fbfc7d929752
font_02_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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