Malicious PDF — malware analysis report

Static analysis result for SHA-256 0559b96c4e5dace9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 13:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40ad94661ea2e53dcde90d39e772ddeb SHA-1: 80498651ffebd0a211d92bed5ab53338121941c6 SHA-256: 0559b96c4e5dace952f4da1cd3420022b459fcaaa750ab42eb4f81c0d2363d9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=shahezad+kazi+bandharan+book+pdf+2020 PDF link annotation
    • http://bbhshipyard.com/userfiles/file/goferozuxarizoxelakawetot.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/24636236382.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/74879020088.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/2070875401.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/jebizilugifotoneniwu.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/morozi.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/86133477932.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906170048.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911021617.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/botopufozulali.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/96275276463.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/nupojuporavi.pdfIn PDF document text
    • http://stringladies.cz/userfiles/97124236180.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/42220174620.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1fab7e5c6b65a01acde6d316d1a039f4/bekozak.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339fa49304e---25733247249.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/5088051703.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/53369528393.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/56442519240.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/lobesag.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210921121813477517700.pdfIn PDF document text
    • http://orenprom.com/img/account/file/tifuregujegax.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/jarukadapaful.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/depig.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/muraxoselu.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/mubogoguvijujux.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_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 10892 bytes
SHA-256: c3428723c59c74d67da075592a4de0565526420ca33fe3706c279f2178df6ba3
font_02_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 15300 bytes
SHA-256: ab5d69c03cee77701fa39663dbbb43a914aec7e240575636e86af367da169bfc