Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d92434ea83d640…

MALICIOUS

PDF

86.0 KB Created: 2021-09-12 01:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d333f837ff3df1b0e00f50bba2b44a5d SHA-1: bd953c097ace207d23ffb170ac9582fb1d61e413 SHA-256: 89d92434ea83d64098ad480c332d2f026c1bc7786e41cc63968c4c82231ac71d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.aicsmindia.org/ckfinder/userfiles/files/9412733319.pdf In PDF document text
    • https://rmp-traueranzeigen.de/cms/files/ponekewoludekavutoke.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/jufipiverajikin.pdfIn PDF document text
    • http://bulmarconsult.com/files/jusosorejagatavar.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vefegadefam.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf757d6fd---301128798.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/filud.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/ziluwaboxojapoxi.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/8767391341.pdfIn PDF document text
    • https://spacio.hk/attachment/file/vijojenezugapodarux.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/72570594549.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/subixuj.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/zimodavevu.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090512561173499.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/jatefirodanurirobadab.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/73555190640.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/gijulafaginenimopofoxul.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/42391342319.pdfIn PDF document text
    • http://thongthien.vn/upload/files/76510341116.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/jusejunivit.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b52acdca---fovorizuturadi.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/vodagafodekawame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=unity+build+android+command+linePDF link annotation
    • 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_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 19016 bytes
SHA-256: 9f1bfb848c10d0466d04e9464b7f234fd428382057733b587862bb12579db6cb
font_01_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 10724 bytes
SHA-256: ccc05f215a165d6c553ab0f48492e1370817e70ab80df8c05ef9e3142d3994b4
font_02_sfnt_off00013241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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