Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23ef95040963112…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 19:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90c510cf220607db81d859ad6cc43923 SHA-1: 422aba2e503fd8f40b9731e4b56ca0f8cb72ab02 SHA-256: a23ef95040963112d546e39ab028fa0ec1015d65046016e080dd00d7fe9d89e5
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick the user into downloading a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=app+kodi+tv+box PDF link annotation
    • http://goldenteriyaki.com/uploads/files/99806717985.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210903102559.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143ecd0afb85---93282071760.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/63572443693.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/lijenanolederotogirilana.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/dupujuru.pdfIn PDF document text
    • http://rnralpha.cz/res/file/gulosefadiruwixekimasune.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c167b25f83---90126783516.pdfIn PDF document text
    • http://saimiri.name/upload/file/91789495757.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/purogapaguku.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/litixizizezizujef.pdfIn PDF document text
    • http://skupka54.ru/upload/m/21868273223.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/bubure.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/72610407997.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/lojoretijokugetenajo.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/88741679882.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/3307646219.pdfIn PDF document text
    • http://farmina.ru/uploads/files/ruxadupapaxavezuja.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/71523672847.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/zivutovebilozozute.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/viwazajovogate.pdfIn PDF document text
    • https://tessuno.com/upload/files/6131cd6b5b68f.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/sofunepesufazisijapober.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_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 10056 bytes
SHA-256: edce8490b8ec285613ac1af80dd57970475e314a3ea0a8091f808e01ca85d0b8
font_01_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 18780 bytes
SHA-256: f85192475ec24761bcac7489bbc227e2a641b55f4ede7fe450c54fd1e4c0fb4c

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