Malicious PDF — malware analysis report

Static analysis result for SHA-256 789cd4f10ee48b2d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 09:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39acdb0e1c8e15e5275f57d55901383d SHA-1: 619b767929b22fef5ddc52b2259692cae57b98b2 SHA-256: 789cd4f10ee48b2d982404dc078a0a1589f72db4fb9e36172688b032315cb331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent of hosting numerous links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://haidangpc.com/contents/files/79287744594.pdf In PDF document text
    • http://canxetaidientu.com/images/file/63524692508.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/luduwidubogarukefozegosaw.pdfIn PDF document text
    • http://vititanon.com/user_img/files/lowejamudazizosofalo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a1996620---11579865269.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090304033285.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/80250690219.pdfIn PDF document text
    • http://prestopc.it/upload/file/91372305789.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301be528c93---48632489349.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/giwazidufopasixonosip.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/rubiruxebalewokox.pdfIn PDF document text
    • http://gr-chem.com/upload/files/zegiziduvidijikugavukujol.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/mixazenafulurabitavose.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613850975ca15---62003839524.pdfIn PDF document text
    • https://projetovm.com/uploads/files/noputej.pdfIn PDF document text
    • http://martonelektro.hu/files/file/jovuzip.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/96791120617.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/81469432491.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/23020693062.pdfIn PDF document text
    • http://citra.cl/userfiles/file/wanelakazap.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/49903036438.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/60687103122.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/75809956792.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/31834543277.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/12264539570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=acnl+the+roost+guidePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 19904 bytes
SHA-256: 4d2f3d54587fbf953342721bc9ab03c2e5780b85bac87c7c264b71c8935747aa
font_01_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 10568 bytes
SHA-256: 85e34d3641edd708cd2688734f9f18e31797772ba800d1d5cd696f67776040aa