Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7ce082d31987e1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 05:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f06c1df38b0a923521b27f97a7fa8b7c SHA-1: 853e9a37cbf64e36b981a6a954d72a9d2f69dbce SHA-256: 8d7ce082d31987e11633a6c01096ab7ddc4a42c5b7b1370b84badaefa08559e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate that the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=run+android+app+android+studio
    • http://kfoodntea.com/dataroom/file/94200207275.pdf
    • https://szekszardportal.hu/userfiles/file/39618367017.pdf
    • http://eco-building.cz/UserFiles/File/namotipupetozogifugi.pdf
    • https://possamaiferramenta.it/uploads/file/67692532219.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feridiwixebuxokatoxudula.pdf
    • https://nexapos.com/upload/files/24220106868.pdf
    • https://franciscovalles.comtraining.cl/userfiles/files/rawobodudefax.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/68548985600.pdf
    • https://kalimati.in/userfiles/file/garefi.pdf
    • https://underworldgear.com/upload/users/files/81501154525.pdf
    • http://good163.cn/Uploadfiles/files/totopiwifilonu.pdf
    • https://saigonservices.vn/images/uploads/files/xegudepasijaxevog.pdf
    • http://yoshitomo-kokubunji.com/jcfiles/file/85908773722.pdf
    • https://chrmglobal.com/userfiles/file/29340626222.pdf
    • https://dalycity.com/wysiwygfiles/file/358455528.pdf
    • http://luluscafeonline.com/uploads/files/35877930449.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee4a9d409---95195801904.pdf
    • http://minerva-collection.net/files/files/wovikupizafenuk.pdf
    • http://gyuco.com/uploadfile/files/20210921_052709.pdf
    • http://shannonlakeestates.org/fck_images/file/43604679238.pdf
    • http://vrakskodamnetice.cz/file/89621947096.pdf
    • http://ei-windykacja.pl/upload/file/zelotanixesamo.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/nuregobedimakoze.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/sazefak.pdf
    • https://nieruchomoscikomercyjne.co/files/file/28164275775.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_off0000de1c.bin
1b0899f932f8ac3de6c90b1d6ba7cc30fcbd513599e44e3dd58f0b14c980b7e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 17420 bytes
font_01_sfnt_off00010b6a.bin
c6a0bfa59a91367e11501ab7092cb61428e883995c1c453181c07ba4d2ad71f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 10352 bytes
font_02_sfnt_off000122e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 16792 bytes

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