Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b20f34aa72e926b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 10:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11be06e3c2e0ec4899da1098aaccfbf6 SHA-1: 150e1dfff328ad06369c1c65fa6fc563605bd260 SHA-256: 9b20f34aa72e926b59952e3a25ad032f14ec48aac2c97fe8093d7455cb90f4f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to potentially disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the nature of the PDF and the embedded links strongly suggest it's designed to redirect users to malicious sites.

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 http://electronicaindex.nl/images/uploads/35281727761.pdf In PDF document text
    • http://cokhiminhhien.com/media/ftp/file/ropubenujufimevekibagun.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/42882845151.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109090810046835.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/79554867172.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/dixasokokemeluloxux.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/51462655680.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/97488038569.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613375cb68aed---87183165580.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/napazek.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/56619140918.pdfIn PDF document text
    • http://splogservice.ru/content/files/gasolerosugor.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/fejesemojiwupip.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/97225410720.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/83005034414.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/lolunimamaroxo.pdfIn PDF document text
    • https://vestol.bg/files/file/dolesulubabomu.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/41281705274.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/dekupolopaw.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/ludixer.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/kidik.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/91839114206.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/rewodamirosenutefed.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/97500171333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=drive+2011+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_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10608 bytes
SHA-256: 3bc5fc2d69ddc5258280e7a5d582b37c3758bd2f72dfa7a863bf972b41a4d584
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 17844 bytes
SHA-256: ff4c1498f50599fd79f9a2f8f0e35514c3f7027c5387d5170689558f15d5015a

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