Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dad007f93b7ac9e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 02:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 594cb95ee15e203927189395d4e577c8 SHA-1: 8c31e21ed07715824f5d67a989ad368b491a696f SHA-256: 5dad007f93b7ac9e23044fe2d7491ef01d419a4c2323989151209ae510035057
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://laborke.ru/uplcv?utm_term=kamasutra+kannada+translation+book PDF link annotation
    • http://leylatoprak.com/userfiles/file/53106800513.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/84993052123.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/poxuxepinigomulivosule.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/97630335724.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091706164292.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/31388410366.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9075aaf6---39343637282.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/pamezuzoma.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/29222821138.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/53304462142.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/povonekemigopasokeme.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c08367bd92cd2868b27d09d614b001ee/76809254554.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/tuzulorafutenanabigigomut.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/gedafomer.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/poponiv.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/xaduwivodup.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/kizopepologumox.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/2901827364.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/27878842959.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/3485341388.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/11330118754.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/67108204224.pdfIn PDF document text
    • http://geose.ru/userfiles/file/31409115623.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/65498130404.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/66179368564.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_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 10600 bytes
SHA-256: 0aabd90cd8364cbcea4ef3747e3d4ffb8f5891cf1bdb22440784adafcbb73146
font_02_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 19860 bytes
SHA-256: 173e1767e5c1713ea812360a0c2f468d8357e35499c2921348f5a29c9c7af2ef