Malicious PDF — malware analysis report

Static analysis result for SHA-256 082689ee25b35df6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 04:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b99b8766a2ef6d3498db6990f5d5b279 SHA-1: 4158f7ec40f5ad17a85d576773e2f9ea0b63e677 SHA-256: 082689ee25b35df66e7915a7eb1ef2aeeb20d6e44e475a0645812abda473f579
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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 https://garglob.ru/uplcv?utm_term=highest+rated+games+on+play+store
    • https://damiel.eu/userfiles/file/55211055581.pdf
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/64808689507.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/22116011457.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613752a3434b6---19091566111.pdf
    • http://jinruily.com/UploadFile/file/20210907155758529.pdf
    • https://santehsevast.ru/userfiles/files/xifimosepivatadizaziniw.pdf
    • http://mnarch.it/userfiles/files/gezepovofizojup.pdf
    • http://galsabino.it/userfiles/files/bumabomufepatejakubiko.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/33643159950.pdf
    • https://rainbowfurnitures.com/files/files/gurudul.pdf
    • https://citytrafik.nu/images/file/92016687613.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/mebikanutajapupe.pdf
    • http://dribblebar.pl/userfiles/file/xoniju.pdf
    • http://oodow.cn/upload/file/210903013149747545vka8ghdzujgc.pdf
    • http://hoteldanang.vn/uploads/images/files/roxowetumoloxuwe.pdf
    • http://www.hgbehringer.de/img/files/files/goxokufubojatuzasipixe.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/56022986709.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/babavenexiteneles.pdf
    • http://congseng.com/uploadfile/files/47054636112.pdf
    • http://vning.net/filespath/files/20210906230800.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/210f0cb14776daba567ef9b9a4df1c43/kureruxep.pdf
    • http://wawa757.com/uploads/files/begovukukumelusalugorudo.pdf
    • http://nenorm.com/files/files/wowolinodazimumulexu.pdf
    • https://conexkarvan.com/cache/fck_files/file/27828277906.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_off0000e19e.bin
a96c6c06e8d93c2f46724d709ee9202b8d7f4ee2f38b602a6f614f6ce035ebf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 17640 bytes
font_01_sfnt_off00010f81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 16792 bytes
font_02_sfnt_off00012798.bin
1d4ca732c5768a2d88c67ccc874848a8eb2b8b423306ff30716fef3068bad989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 10944 bytes

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