Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48b764876b902d9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 09:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84f885c473251c814046d6d08148a9c0 SHA-1: 81aef5ccd65158df3c789a5994357f04a0e5c024 SHA-256: f48b764876b902d9c4dbffbb8c3b95945ec854fc5a26b7bba7a7b5223b8c31fe
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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://irlanc.ru/uplcv?utm_term=android+interview+questions+for+4+years+experience PDF link annotation
    • http://nage-z.com/ckfinder/userfiles/files/lisaxojozo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a7822aac6c87b32cd9cc811cfda98147/69571228910.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/16150210442.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/bibunisotinul.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/losebesubodijopeminijava.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/vixexon.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1pbdvtd0mqfctc5q7e852c33n0/37482234280.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/67869273100.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/tirez.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/negozetovu.pdfIn PDF document text
    • http://ux-school.ru/files/files/36912653855.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/49580620790.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/20160707991.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/21895955768.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16137d13af2773---sukonuju.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/9758680832.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lidepilapajilifixem.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/digonugupemimu.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/75816185707.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/zorosakorofezumojisat.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/madezefitimolirosu.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/91685402331.pdfIn PDF document text
    • 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_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 16740 bytes
SHA-256: 7636ec7f89fa9c52961a65cae1847a059f2dff175fcef874af6653d636e1cbf1
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 11240 bytes
SHA-256: 827a43f6bd592304fef48b37db2f46699b4c4edcbbb727178d512a5854d85728

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