Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbdddc3655539ea…

MALICIOUS

PDF

87.4 KB Created: 2021-09-13 21:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6599c408659c65bd39f4c0f490649177 SHA-1: ea76befc24c5d6071a75fb3ddd52dad8b82a7430 SHA-256: 5cbdddc3655539eaaf8175118e9d86c598372e65805848a9fa1df935fd5712b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://gospelpour100voix.com/fichiers/newsletter/file/46938294922.pdf In PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/laximujav.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/papaduboragu.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/rufawepasowutokin.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/797ba607de74d1b27b69fce9c08d3c0d/20261623612.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/80483398047.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/welutebuxogogu.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/bofuxedimasukubet.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/tipegixigazobiweso.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/jabuboworakifewibitej.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/josizezejamixoki.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/48311169195.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b36cad58---77522578953.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kedafasibotorigadimo.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/71447277803.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/mikalane.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/zoniwozun.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/merinezojotawusezesuwuro.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/gejizesosabikerade.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/20847272791.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/76415679906.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/96143145171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+skyvpn+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 10488 bytes
SHA-256: 0685b19b98300af888ea1aba95edcc5cd063d0fad87472ba42157df67bfd08ab
font_01_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 16308 bytes
SHA-256: 64002d6c193b04299b2bd313aeaf080f044855efb51e912375018143b79200ff
font_03_sfnt_off000116c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C3 22068 bytes
SHA-256: 39691bb8347c063911a99b7cb16181fd49a7fe89c1e970e84264732c6ae7e941