Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e281a99619dcd9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 08:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0747fa70cfe9491da9c276e30ca4443e SHA-1: 06aea727971ba697bdab2cac986384c9318ae6fc SHA-256: 45e281a99619dcd9043ab738f99773df6bc0ff0ba952cde473d6bf926ec67dc7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to obscure the true malicious intent. The ClamAV detection and ML classifier further indicate malicious content, likely phishing or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://geoass.eu/userfiles/files/49443719956.pdf In PDF document text
    • http://studiogallerani.it/userfiles/files/13511419171.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210914060847.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/80927957122.pdfIn PDF document text
    • http://na3.it/misc/file/kesaroj.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/18474407247.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/87139667484.pdfIn PDF document text
    • https://susta.vn/userfiles/file/14227429521.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/julus.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/61684188291.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/2288865508.pdfIn PDF document text
    • https://ccskin.com/geektic/files/83259370831.pdfIn PDF document text
    • http://dsraxys.com/uploads/vovupafidoge.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/95061928932.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/wasajapofurelukesobupe.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/50583471376.pdfPDF link annotation
    • http://studiomanzetti.it/userfiles/files/mexakubatupidasizur.pdfIn PDF document text
    • https://buyafranchise.org/files/files/44925772504.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/rawakegomisifowiniroto.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vumegiwosonikopibedowa.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/23344306880.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/nififu.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/50952942269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+game+ppsspp+downloadPDF 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_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 18000 bytes
SHA-256: c6678d1f7299f95fa6c0d3712d53908597b6d4bf99d7e8af9840fbc5b05cff5a
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 10772 bytes
SHA-256: 22251779ebad03b500daf7a71e8e7030bcf8913118aa1012cad5dced9efdc9cf

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