Malicious PDF — malware analysis report

Static analysis result for SHA-256 879d1693bcb7c542…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 11:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55871e23d2bf4f472f3cc0cf989de3c3 SHA-1: 0e90eee643a26d7a189526c61ad9268293e72d11 SHA-256: 879d1693bcb7c542ca27d9900f2b657ebe090618c6e8c1d76d40b74bc4ce4d5d
154 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The presence of external URIs and the overall structure strongly suggest a phishing attempt designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=ios+to+android+bluetooth+file+transfer PDF link annotation
    • http://boschvietnam.com/files/usersfiles/files/kutogowakowigufa.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/wonasikukufepuvu.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/dovivosifiwenotetopib.pdfIn PDF document text
    • https://unaizahic.com/Files/files/47979400914.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tefumubatuv.pdfIn PDF document text
    • http://josquin-capella.de/download/puwudaxatonalesexunax.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/ravopawetibosotofiwuxevov.pdfIn PDF document text
    • https://parkettworld.com/upload/files/piwonadovoratewesimabasep.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/32753222482.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090315020935.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/25133097508.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/97881026214.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/59930982422.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/95953913773.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/99136439577.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/logodiwamufigazesukin.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/115633c1251d5f06e424cd8fa3cf9178/wajokipusetizawedizun.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/62661686296.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/zojupovewu.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/joxefadare.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/kajulexetodi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2305a141---sokofetipoxabife.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/lekavokapipa.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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 10640 bytes
SHA-256: bf3e211ee34a82b39652ddc28db5d4aaab8fc4bd96eaf953b407ffa6fd94f61a
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 20308 bytes
SHA-256: e1cf6d7fca260ec660d2c95555178576917827af55637b3e493bc565941834f4
font_02_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1