Malicious PDF — malware analysis report

Static analysis result for SHA-256 8506434e47ba74e9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 07:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c39546da8eca51ff2957d44bd236320 SHA-1: 469a7b1c7480b6f34fd7f65faa6356c6e312a4a7 SHA-256: 8506434e47ba74e9d2d4232d0e3f92de8730dbd604ac23be4c960161a51d84d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are unknown or potentially disposable. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://kohphanganhotelandtour.com/userfiles/file/dabazugilarokoxafusubufe.pdf In PDF document text
    • https://tamphuctriland.vn/upload/files/turexagukijadumarosijeg.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/perakadijit.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7c7f338c---vazovosepilu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pujulosifoxomesex.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/wanap.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/fazenubifofu.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/zusinarageduta.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/budirasipovasojaxoloze.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2bf3d1a41---komepalaw.pdfIn PDF document text
    • http://net-marketing.hu/images/files/16392803071.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/mugenem.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/zarolivatiwobemojowogenav.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/kirabemogamezoge.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/momovurazumilumij.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/92312769173.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/padomuwatikufitejinu.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/49967193732.pdfIn PDF document text
    • http://cocoal.com/uploads/file/890426663.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/nowajug.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/kusafimafifejuwel.pdfIn PDF document text
    • https://polytex.de/sites/default/files/rokaralijepatanebowovidal.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/72269454380.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/gixoniraduvudotada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+open+ps+file+in+androidPDF 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_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 10568 bytes
SHA-256: 367e7543d7a7bb2e2a64ede93984bc260d596e6e329f86c3f9d29725a800de81
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 18688 bytes
SHA-256: 779f05d20e52f5a4da0ce854d885e0bbaaa9b1a003655db7ffa49f850cec3a43

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