Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc9c76f327316e6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 22:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d665b3a77c31fa0dd4af7de1e83833e6 SHA-1: 99d5aa8f72d6e4403091a09736f4a684305123b4 SHA-256: 2fc9c76f327316e6cfa588eea890c1dc0ee1ff2c89eb1994e22a9695b25b9cb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to a collection of other PDF files, likely to facilitate phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://thuexedanang247.com/uploads/image/files/797935608.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/xulumemigawox.pdf
    • http://chafewyuok.handysociality.com/upload/files/22535212147.pdf
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tokeso.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/kiditijafakorutaz.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/51780863848.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/59583645606.pdf
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vodemuvitezitimabidi.pdf
    • https://stiff.pl/ckfinder/userfiles/files/41638586463.pdf
    • https://tepihtrava.rs/files/bubexinekugob.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/kunulubep.pdf
    • http://mobiliteit.nu/files/14819354256.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1cdbd775d3ab080b023f1343e80fca90/73057160437.pdf
    • http://savvyais.com/userfiles/file/52654195287.pdf
    • https://branpc.in/ckfinder/userfiles/files/bonulo.pdf
    • https://igk-lilienthal.de/downloads/gukatof.pdf
    • http://intproplaw.com/admin/uploads/file/53599982750.pdf
    • http://loadcell.vn/Images_upload/files/xebomikodozenilaf.pdf
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/xixit.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/kebefabefeveresud.pdf
    • https://pieseautocomenzi.ro/userfiles/file/fapemevufezazebomam.pdf
    • http://importfoodfair.com/userfiles/image/2021/09/file/polusanotuzumugirov.pdf
    • http://origo.ws/userfiles/file/bavazolakemowufofifizewo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=prince+of+persia+sands+of+time+game+download+for+pc+highly+compressed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d427.bin
66d28f3b74cff11a1f93f31c390e1e2d42f22886043aee865e646f2098022774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 11268 bytes
font_01_sfnt_off0000ee40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 16792 bytes
font_02_sfnt_off00010652.bin
ae1b7babafa3fc0059d5ff7c43d2a273c0c283a5072e2a99c407c24623c3ff29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 17444 bytes

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