Malicious PDF — malware analysis report

Static analysis result for SHA-256 8757df4f804920bb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 11:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82ac129411482cf65defd9a58b4796b4 SHA-1: 18a46cffd8f26ddf47f08355b6c6e247c3d9cae2 SHA-256: 8757df4f804920bb81996faea1f180f16d9821e9e27516c77cda09bc26f616f4
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. Heuristics identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Numerous embedded URLs were found, with one specifically flagged as a potential link farm, increasing the risk of users being directed to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://sinostandards.net/upload/files/70112638161.pdf In PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/77928373866.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/sedebomafamebojokutige.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/gunepa.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/luniwodiranewesufapom.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/65095413533.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/bulirimexof.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/kezesisogeviwugenugu.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/tabalolirujemibu.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/vibirojasavib.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba884ad07---fixewuket.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/45344647594.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/582187cd9eb982593ef8472c1fbda35e/rilukedapuzikikowabogan.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/57024364671.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/fuletifinolojefo.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/49262032340.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/11579475201.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/kasabivikituxegom.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/xuwunuzixikiwu.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/jaxilepojexe.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/kisijito.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/botudewigokodoxurav.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/newitekixamajafobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=enfoques+de+la+administracion+pdfPDF 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_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 11008 bytes
SHA-256: 021583ff40d42d2def893a2d194e05920c3326bd67f9be6e11f279eb71e7770c
font_02_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 17084 bytes
SHA-256: b0d4b835f2679d6b75958a0d396d4887120627d321a7351435a91249d8fea7e2

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