Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fb44f770da7cd3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 19:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a3cc474152ea4874973b9103ee53fda SHA-1: 27378d2e35e8b7fc6b8dcfce8604de31c5118aa0 SHA-256: a4fb44f770da7cd30885153228828f2c14763a8f0faa9976fe91e98f2f84e05e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://asu78.ru/userfiles/file/rivovodisiwonow.pdf In PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/24710036240.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sibalatadipit.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jijomujadepab.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/97404785624.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/76130933783.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/timafitajux.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130e7134fd81---fegezerixixuwonola.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/48815709582.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320510e2bca---8675545327.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/wakawosonelejali.pdfIn PDF document text
    • http://enricobarraco.com/files/gujumidasobotexaxim.pdfIn PDF document text
    • http://rem-proekt.com/f/file/latebobanabavaf.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/kodojufunuke.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/71383304280.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/tuzuvi.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/lewupaduxelunegakuviw.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/62370661600.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/86132939747.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/rafekar.pdfIn PDF document text
    • http://salespate.com/userfiles/file/megoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+study+for+a+maths+degree+lara+alcockPDF 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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 11112 bytes
SHA-256: 3835bc242703189cb9b5ba66e4fd50f4ce939868471f0c66b170a0938c7c953c
font_02_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 17536 bytes
SHA-256: 56b17c36e8f93435ece8bd7670ecae359d008d9b1cf8b7aca61ee4cd8fd6afc7

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