Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93b3945ff2c0aae…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 16:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22763c0dd633d3a0f04c248a29df9a03 SHA-1: 96ee2e37855a9556c3862a0897bdd0d44f0f917a SHA-256: a93b3945ff2c0aaecab85d09aa48ceabb1f0422869ce2d91eab9c778170b9156
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://catamma.ru/uplcv?utm_term=diksha+app+download+for+android PDF link annotation
    • http://librojuridico.com/aym_images/files/17117491102.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///wifibowod.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/tumuka.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/63346823676.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/dipisalopatar.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/lelexilipatamutefaxuji.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/83790704807.pdfIn PDF document text
    • http://espwireless.net/uploads/file/xisanupunowalofixe.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/dukogisin.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39d849f94---pumorixolepogafifivek.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/31941826562.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/57876404622.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/lujukiwakujijav.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/buren.pdfIn PDF document text
    • http://bresky.cz/res/file/puzik.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/32348907439.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/rodipovunevuturuzo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/zusosiwaw.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/62336362517.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480ba6791dc---34615649446.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/38668561904.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/81349609864.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000b225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 10544 bytes
SHA-256: de963bf504bb43e1f0a9af0fad46709c23c3b00d4f27336d4518de0aec4d8b0f
font_02_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 18660 bytes
SHA-256: e999ca2b030c9eacff41eecc7d68433c6eec6c6f9e9c07eb1a293bc010103e30

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