Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a08bf3336e6637c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-29 11:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 090c130a080b8cb0a22cffcd2c805e60 SHA-1: bcdfb70439367008a23aba9fcaa9a12e5d92cef0 SHA-256: 8a08bf3336e6637c846c39e5fafd4f7d7235d356c0bc8a52258fac0d4e6aff54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains a link farm with numerous URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting external sites, likely for malicious purposes such as downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://autoscuolemontagna.it/userfiles/files/24685075293.pdf In PDF document text
    • http://tsrmmessina.it/userfiles/files/8951207524.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021092807191247.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/sizurefewufafekan.pdfIn PDF document text
    • http://identik.hu/editor_up/50226341203.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210914_061342_102.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/22621790796.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/78119788835.pdfIn PDF document text
    • http://kodemari.info/data/files/noguwaz.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a9db3e7f---goreranuzuvezeribevaga.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/97560040746.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/67512324049.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1720c1920---12001088485.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/62527467309.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/95750487910.pdfIn PDF document text
    • https://priscar.com/documents/files/50102233599.pdfIn PDF document text
    • http://unsersohn.ch/images/file/12852744929.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/zijufewawusenifip.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/foverorelarimorafu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vokoxanulifebezuzobilu.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/71210908013.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/duzokedanogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=vpn+tomato+2+premium+apkPDF 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_off0000ccd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD0 10480 bytes
SHA-256: 959e03449f413bff70498826df6bb87b4dc1e458c7029887212d662826a95482
font_01_sfnt_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 22968 bytes
SHA-256: a9bf37a17d79c9a6e62fa4c4b1c93ac4ce4d1cdd657f81e366211ebce0580fa4

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