Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9473da283d953ad…

MALICIOUS

PDF

71.7 KB Created: 2021-09-29 12:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c2bb502c5ad63d097ef9ec7591499a3 SHA-1: 23968c8b120c2a54c1c0cbb32cd8a5ca14de6d5d SHA-256: a9473da283d953ad83f2e16cc1adda7d8342cc54f9c5c54ee54a4e2d7bc562ea
146 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. It contains multiple external URIs and an IP literal, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=binary+denary+and+hexadecimal PDF link annotation
    • http://otestmanager.com/club/data/userfiles/file/20210923040707.pdfIn PDF document text
    • http://sinostandards.net/upload/files/99695890717.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/vametumomabopapof.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0948053001630826316.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/pabepuruzivokekajo.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/81807348356.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210929144613.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/26853279914.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/20804185134.pdfIn PDF document text
    • http://p-energo.ru/content/file/13481117937.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/telilajurusomuvav.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c00b111c53---7539074408.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/92054271979.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/95415024920.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/linipamefezibusubuseg.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/82517300442.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/jejilibadasakabixesek.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/54933265974.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/0dbcr4q0q4v59740k33fs1c7lt/poluxadamalu.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/bejofififipe.pdfIn PDF document text
    • http://warehousetraining.ie/images/26248313908.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/49103560524.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/30372325878.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/51803989764.pdfPDF link annotation
    • 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_off0000b2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EA 18108 bytes
SHA-256: c89254f7dff2e7ec645d83170c9396a8e2cec0c388f25562a4e51e3e7f7059c7
font_01_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 10516 bytes
SHA-256: ef2d75be55739f45398a896bb7ed1afa639909ef66364a5bf58098466f52fb6d