Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddf3d62c8e750d9…

MALICIOUS

PDF

72.9 KB Created: 2021-10-02 14:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4bfe7fb18e4e79f54861cbb4af68586f SHA-1: 419f07bd8c975656ee69029c88e2eb4d7e32be1c SHA-256: 9ddf3d62c8e750d9878c235c5352e9e7e6e0f85c8201ae720c8a85afd086d1f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs suggest the document functions as a link farm, directing users to potentially malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=touch+episode+guide PDF link annotation
    • http://anm-av.de/uploads/files/98664737172.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16151a37b7aa31---pedekosavuxofovixog.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/difirofelapigurasunum.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/11072149859.pdfIn PDF document text
    • http://mcutech.net/files/57011754806.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/zizurefodasobonufaride.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/fijokuk.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/vixexelatatos.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/japanerawoga.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/89625944432.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/37948727983.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/xaxevovitamuz.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/bagobufaxirijaredipemunu.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/foseluwikow.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///zonulugosapoz.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/785357351.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/24028684389.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/vowajodepefakasiliduv.pdfIn PDF document text
    • https://businesslife.com/content/files/36712054280.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/4330856828.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/78114123676.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/gujelolaresegubuxe.pdfIn PDF document text
    • https://onlinendttraining.com/files/rinumobaxixadosebimo.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210906205402.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/39698503130.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_off0000b85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85D 17864 bytes
SHA-256: 7d61dad979686db094fdcbb26ff4019ed97f98382b059895765fba8a4d15fcc3
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 10344 bytes
SHA-256: 2c1279617617bbe1879219f3bd94335869919487ec1a965fb15a29567fbef2dc
font_02_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1