Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f930ee2e39655b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 06:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 452e184b1f9ebfa85cf943077d2fdec9 SHA-1: 352ddf114b88a277e6c24ccd4e6ddc9ab0bbd6a2 SHA-256: d1f930ee2e39655b396c75e0dd6aa7f98b289dd8c2894de37f9dadc17e2e6f2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on unknown or suspicious domains, suggesting a link farm or phishing lure. The PDF structure and the presence of external URIs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://okna-kurska.ru/page_edit/_samples/userfiles/files/62961159515.pdf In PDF document text
    • http://nktrading.qa/file/files/27318897375.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/44679667491.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210902190518.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/palibeputufebema.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/84035237873.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/96547152488.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/dovonanitolitesalagudo.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210903194656_132233824.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/wutawumozovodetobomeruda.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161341a3d096bd---99890017080.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/50337217490.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/18926189093.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/3802889239.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/76528475443.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/nabisinuwofonusosijozag.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/pagujeposobi.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wujekivogodobudoduni.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/40916616301.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/sudubofoda.pdfIn PDF document text
    • http://vuason.vn/upload/files/41659034013.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b348256197---3378509848.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/12792806077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=multi+parallel+mod+apk+downloadPDF 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_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 16936 bytes
SHA-256: b4bfb9b1900145d1d4745508b70a109a6b333c624cad2f81c93b51a52e3dd368
font_02_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 10656 bytes
SHA-256: 44fe63a2f36669eed163f4e9d8a90253d4b33bba55cae6e8df9978d71880aa78