Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d929008e6d2868…

MALICIOUS

PDF

70.0 KB Created: 2021-09-09 22:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3ca55a899ef87d8a35c38b8956448ac0 SHA-1: a7481fa49007ef2284cc6dc200f876b9c7cf1d0a SHA-256: 63d929008e6d2868521c41f761947c1b4bfd5384ac9d6849fe5088d0d5a4ada6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=new+interchange+book+1+pdf PDF link annotation
    • https://myarchitect.es/ckfinder/userfiles/files/31237671518.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d3ee78f1bc5890db43ba41f82d133508/50608203271.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/tutotarimo.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/jinelera.pdfIn PDF document text
    • http://cpviettin.com/upload/files/49466981151.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/54296259919.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/potefomilakeses.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/539784290.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/gelol.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/82614465393.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/caf0560a8fc4451154a91422ab8efeb9/32806748225.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16130944446b2a---51686084468.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/lazupapinimawikadur.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/bedesog.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109020336595599.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/nazisa.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/dofixepomeriwizov.pdfIn PDF document text
    • http://byecook.com/ckupload/files/voziv.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/40631678736.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/37655044489.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/mebef.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/24133333174.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/32460797344.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/bepevubolefuzem.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/23653194768.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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 11032 bytes
SHA-256: e45e71ff5a1b0f4e25104056f56bc37d0e06594c8ac28f9609d2b82acfff077f
font_02_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 14540 bytes
SHA-256: 6c5efb1fd5be08e1b0d97d131795af8b6f4eca6c11e63b2d4290587734436ebd