Malicious PDF — malware analysis report

Static analysis result for SHA-256 381a329e80f5c038…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 22:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 475a40309d0396f6d8094aad8ab70855 SHA-1: 9ab9ebd4eeba1d77c644c346bc9cb31be1f3250e SHA-256: 381a329e80f5c038132081259a65b684496ba0d3e67c3d14a0413880faac2989
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to external domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure malicious activity. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirects or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3238

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://archism.ru/uplcv?utm_term=android+lollipop+icons+meaning PDF link annotation
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/futunarowu.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/53465370104.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906093454.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/kisagesawotosilojenezate.pdfIn PDF document text
    • http://houselandia.ru/files/81170550300.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/574561988.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/11261751729.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/jexunumisu.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/84834555624.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21659154860.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/57860195313.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/zonubizosepiwivas.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613179d8ccea7---66481711966.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/kazanapuvipoj.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/gugulopilo.pdfIn PDF document text
    • https://seikai.jp/free_images/files/katojikatepazobatotirix.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5fc1c48d5e7f39e6776a88736ba45fbf/2698942650.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/25986567198.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/2824239061.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/lanunarapubasepusoxenivo.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/tulavelafufeguxanetafex.pdfIn PDF document text
    • https://camphacement.vn/upload/files/92200384135.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zabixezozisakeme.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/nokibeguziti.pdfIn 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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 18104 bytes
SHA-256: ebfd14841eee39cdaa2f61fb54a64f1643490e2b12b4a32d2a7a6c9c12eb53b0
font_01_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F02 10740 bytes
SHA-256: 53f07ea12fb316cb793b67a6bd450e438f88d66a3e39b05288f4889223643ac5

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