Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7222f1ebac37ba9…

MALICIOUS

PDF

97.0 KB Created: 2021-09-17 14:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cd78c8469d66455cf710ad49b40ad71 SHA-1: 054263c02e25f7f2c5e3ee5a3e17335eb9a714e5 SHA-256: f7222f1ebac37ba9972d19482c84e2383aaade18e504bebed56a6123b2d18b6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms or disposable hosting, suggesting a phishing or malware distribution scheme. 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 0.9942

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://ketchas.ru/uplcv?utm_term=square+root+of+2+divided+by+2 PDF link annotation
    • http://gnox.vn/upload/files/14831007152.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad3e07b80---meribirukizere.pdfIn PDF document text
    • https://chineseclothingonline.com/File/73659334357.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/63555006517.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/gadakem.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/denotanabotaju.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fugopijopogizuzemefepok.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/58137805598.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/65497481423.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/sagumetepikukeziga.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/xolutelazi.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/tavufipurux.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/zofipoxogex.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/sigilexidaronekesur.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/kumudazilidemomuk.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/wokizexixine.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/doloku.pdfIn PDF document text
    • http://hiniceshine.com/upload/zipox.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210903155252-81763890510.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/vetomalegodosokes.pdfIn PDF document text
    • https://bselink.com/userfiles/file/17604185524.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/51158933588.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/moxilipixab.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_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 10788 bytes
SHA-256: 93a59f261bc93af8d5a1d4205dc7b1b0a919ae60887063e2c2b0ac55989bc642
font_01_sfnt_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 20420 bytes
SHA-256: b2c55d26413fe2d028e6591104f048c88ecdf4930c8d8b3284d595e3a86faa8b
font_02_sfnt_off00015ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1