Malicious PDF — malware analysis report

Static analysis result for SHA-256 b864f384533d8c86…

MALICIOUS

PDF

73.5 KB Created: 2021-10-01 00:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ba836f3b154d96f0eade4014c04b84b4 SHA-1: bcf59b1e8c74097699cd117b5462fd1b93d4a89e SHA-256: b864f384533d8c86e3612e8f59e562dd161d4b2805b7b4bfea36161829c682ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, many pointing to suspicious domains, suggest an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic findings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bitree.ru/ckfinder/userfiles/files/pogumolepixajujefijugetub.pdf In PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/kasirixogejos.pdfIn PDF document text
    • http://dhf-china.com/d/files/dokelat.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/wufezeboxepidiseji.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/7969534868.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16132a91a26eed---1168394739.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/vunebitunivila.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/84822663226.pdfIn PDF document text
    • http://hueide.com/upload/files/77478295678.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/33836421056.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/11618671659.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/26521521257.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/18496923225.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/xesazujes.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/64201394939.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/xojafisux.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/47231644340.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/bafobutelemojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=a+contrastive+grammar+of+english+and+arabicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B4 14756 bytes
SHA-256: b85218b8dce6162c6fe223fa5a8092c8180f245991d120c12c7d4e2edb7f6dff
font_01_sfnt_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 11112 bytes
SHA-256: a70f7868c5c849ae600904a00c4dc8c55be7a83bedc9b5e51d0d67768eae75ef
font_02_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 17004 bytes
SHA-256: 1433fded29aae041a3fd2a7c201252c8006738d9b88bdf90fb1975ecd3ac5d65

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