Malicious PDF — malware analysis report

Static analysis result for SHA-256 4593d7b5124e4780…

MALICIOUS

PDF

74.9 KB Created: 2021-10-01 10:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b7ff5c35a9317800b6ad6094ffd1eb2 SHA-1: eaca6e2fe16669aaae78f3e92706d1dad12cea7e SHA-256: 4593d7b5124e47802f746d87a3aea43e7b2be4188624d1e0d7353961b347830c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/savapanopanorafarilebokem.pdf In PDF document text
    • http://orderleesushi.com/uploads/files/xatezivivukutuxovik.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/liwagodanemagalet.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cp5fqkdrla7bvhu95bdq6pcttv/31430972417.pdfIn PDF document text
    • https://fototipia.hu/files/files/53427321281.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/savuwafubejinakikuzeri.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/55820370411.pdfIn PDF document text
    • http://coffee33.ru/archive/file/44986462376.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/8996919758.pdfIn PDF document text
    • https://akemi.ro/hirek/file/zasirexulosuxiz.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/vapokemivabim.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/47379608800.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/derolejerutupozog.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/93815726986.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/safenezepititobo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d4a91bbaef87ebd39e8a8bdd3633825d/guguzemijup.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/gananavufanugadujokalusa.pdfIn PDF document text
    • https://mcsfood.com/images/file/35505836855.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kopegoruxati.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/weviwuzoruxaxuv.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/16181771841.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/xepobifiwenoxekufetuvexap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=como+configurar+teclado+no+androidPDF 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_off0000bad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD0 19356 bytes
SHA-256: 746e4e93bfcd67b6053510e375b9fee613721d27c2726f52a3715959bcb15273
font_01_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 10780 bytes
SHA-256: 4d9e3dd20504dbef02e20faffa33279f7cf5915f35b3b74c4c7aacba3f6aa233