Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cca373cdd572df…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 15:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7aeb2702962650ead0379588d726fc77 SHA-1: 7113a110b3463b08ef6e7c890d59a7577a6eed7e SHA-256: 12cca373cdd572df090f91fbe817d23211cc83a693f6ae77a8e0ef85ea0dc3d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=liam+voice+omwoyo PDF link annotation
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/gamobarorulixesuzi.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210901_95F719440025327C.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/025gig8gljq1nqllg2n8s5es30/dakese.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210905_123339.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/53434027528.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/zoxejaxebonirapefuwajet.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/gisiwadipus.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/78380217655.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/xelipogovemob.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/11652266529.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/55920782790.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/nagevug.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/6200777901.pdfIn PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/79309160658.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/megudofoguzazigatakijol.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/lazegupiperutovod.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/2049402857.pdfIn PDF document text
    • https://hiroyoung.com/data/files/69736768846.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/22532197898.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///70721437744.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bc37b63---tofawolisaga.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/rosiroxasavo.pdfIn PDF document text
    • http://orlickachata.cz/files/files/vuzuvewategoruvusobokirab.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/safaf.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_off0000bb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB32 10100 bytes
SHA-256: 7ceb8418f3e11790093c74832f1edef99439d98cf76c6755e1ac7f7ac6aa1d92
font_01_sfnt_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 19584 bytes
SHA-256: 059712b26731f0cc1aca1e70ccb6cf35ca7a0d5d711a34c7013ae04ea819147a