Malicious PDF — malware analysis report

Static analysis result for SHA-256 9714c23a23aa66bd…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 18:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28c12860eb2e14bdbb8e5da519baa71b SHA-1: e990c70cd47df779cfc7fcde4467b0839844fa1c SHA-256: 9714c23a23aa66bd7ec186df048a001761e5e7fd32372bfb440ced5ac4db9c67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=sweet+selfie+2019+apk+download PDF link annotation
    • http://markasib.ru/ckfinder/userfiles/files/kejakijozopuxodi.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/jodaxodibod.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/bumojawujulal.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/75057358817.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219273744375.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613618d4ead74---72590411592.pdfIn PDF document text
    • https://rintrans.com/files/zujosuxi.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/xibofavakoraw.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/45607205263.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/18156315343.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902093414171.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/42459276010.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/33450931959.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161320a8aec6a4---63492489580.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/fifezigiligevabivixojuka.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/82105471647.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///36805874675.pdfIn PDF document text
    • http://eichler-kammerer.de/ruligukimewefo.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/winujipafup.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/botedotokefoseji.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/giwofajutasaxafaganujaz.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/54264077955.pdfIn PDF document text
    • 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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 11108 bytes
SHA-256: 49b469361a5d788d977f7bf4f5025baec2446b6cffda6a8b57f2a3fc77c111ce
font_02_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 19440 bytes
SHA-256: ccbe2d0892da4fb2d51a969976f4b79141307d95b7fbc1daafdfe2bcfe62e42e

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