Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c62258758be2f67…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 04:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b80d9643a882a43fd38d3a3106a5a6db SHA-1: 4b2fdb27023b3968f696b3c06c96d3865671d504 SHA-256: 9c62258758be2f67724578db28d64593e63e1101fd7036c08715dd08658e424b
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grabnerestriche.at/fowiw.pdf In PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/sawipozewore.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/gademagagumavipoguzufagun.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/54812417339.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/tobigasiwurufituri.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/daresulakesenepux.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/waverap.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/binudokapezisazonugoke.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/86429495767.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/kapununekamonoruja.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/wogozawud.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/dapujejijo.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/25806338387.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/43079428267.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/difujoxesu.pdfIn PDF document text
    • https://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/3590058193.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cbe31c6f---29824526740.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab4b4e722---54957637926.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/vafujavafimuxaruli.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/65351699935.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/lanobuvawofimekop.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/waxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=top+5+best+players+in+free+firePDF 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_off0000ad7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7F 15760 bytes
SHA-256: 26c895dd298acd7031c1a3c31d2f05d93473641aacb12ecd91d2d9b0f65ab780
font_01_sfnt_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10700 bytes
SHA-256: 23a2c8e520fff1eb958b5ba0b4bc089e81e185dd6d7032e8aa24b1e078de0747

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