Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0e0dc6243240a1…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 08:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c87d7934f3adb90b1a52a6a74517de8 SHA-1: 2f4cd7f50c4bb075c54afda71d95536c35f58716 SHA-256: 0f0e0dc6243240a16bb030c8227bb4d987ab89aebec2eb67953a0318aca85697
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://oniceh.ru/uplcv?utm_term=murphy+grammar+download
    • http://gwardiajuvenia.pl/zdjecia/fck/file/nexibirivakoxidabizivix.pdf
    • http://sartor.ru/upload/files/zozisafesivika.pdf
    • http://tokyo-sanritsu.com/userfiles/file/lofela.pdf
    • https://limpiezasinasel.com/userfiles/files/nuvinivopunererixozo.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/vogubosi.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/69110165966.pdf
    • http://narcisse.sk/editor_uploads/files/wimevikivororidigawexune.pdf
    • http://tsyrulnikov.ru/upload/file/52772330882.pdf
    • https://sofupingame.net/calisma2/files/uploads/37087749882.pdf
    • http://salonorganica.ru/upload/files/27684065298.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161443f1a6e404---felap.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1615331ff434eb---wagepapituzama.pdf
    • http://notariocprietoa.com/notaria/documentos/files/mujakidigexoroxiwu.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/nubelodaxutagomaxajeb.pdf
    • http://vitrine-prof.com/files/2997974855.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divovu.pdf
    • http://gocep.org/data/userfiles/files/kivetalutasibigitamiveb.pdf
    • http://feach.ie/images/uploads/file/1955865792.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210921_746E98BDF4E39120.pdf
    • https://shinko-tw.com/UserFiles/file/19528873159.pdf
    • http://myshopgroup.com/userfiles/files/47811455688.pdf
    • 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_off0000b1cd.bin
4f2f3777055106b08cdcbd4bd403a91728c0e5ef3946eda263f549e9de3a7998		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CD 10644 bytes
font_01_sfnt_off0000c9be.bin
0aaee938ae5c0c7386d4b8f9466a7cd6d00e56e8ed7a35c44984fb2539591d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 17164 bytes
font_02_sfnt_off0000f61d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 16792 bytes

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