Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f25bf9b96e5115e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 19:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d89e0e5156cd06bc4d02c2e37fa8173 SHA-1: 085a21ddd48db72a251e38bd16c556b9a4b30007 SHA-256: 3f25bf9b96e5115e0c6de4c82ed5116eef9801d7d1f7d736ba76d8aeebfb52a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to obscure the true destination or distribute malicious content across many domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://propertiproperty.com/Uploads/userfiles/files/82059258601.pdf In PDF document text
    • http://kingkady.com/uploadfile/files/38971393413.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906075834.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134c0c3082ad---60510821877.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/90272607611.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090407441273499.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/12032058429.pdfIn PDF document text
    • https://tipresentoio.it/images/file/mevupaluse.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/zuwebaxuxipoda.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/71866999564.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/902758194.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/26722075283.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/lapanomojuv.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/lijemofo.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/99629729451.pdfIn PDF document text
    • http://polkovnik.su/upload/file/refikizuniluze.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/85235849615.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/70413251737.pdfIn PDF document text
    • http://lagrupacio.cat/file/92119685053.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210906225806.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/vimapatujixawolupuvafuk.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/ruwozarobaritilazogima.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/96245205204.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/jalanulubonivevuxoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+walking+dead+season+5+watch+onlinePDF 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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 17608 bytes
SHA-256: 0c4b00df4f6aa94ca9fa5d1ac8beb3151830f7b2ffa95d117bc21c0d2a0b8a08
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 10824 bytes
SHA-256: 3127d233cfccfbf8923849f24a404eee8e6407edf648aeb129fa1cafd4e544bc
font_02_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1