Malicious PDF — malware analysis report

Static analysis result for SHA-256 3430e00afab44c5f…

MALICIOUS

PDF

97.1 KB Created: 2021-09-18 12:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8b795ff2f13b62ea232399f7f44712d SHA-1: 8bd162644d8e65d22495d1c2e4c1b20b19bbabf5 SHA-256: 3430e00afab44c5f145d0f3a529f8de020051a647fc42f537d41e8e4b5885bac
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to direct the user to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point towards a malicious document designed to lead users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://allytemp.ru/uplcv?utm_term=dragon+ball+z+multiplayer+games+for+android PDF link annotation
    • http://ruben.pl/ckfinder/userfiles/files/48339963356.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/42276789878.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/16625417294.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/katogegowipoxiduz.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/faxalow.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/29709405409.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/vevuzo.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/54795927391.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/75921125020.pdfIn PDF document text
    • https://breedlife.com/upload/files/sagulibisom.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10376055054.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0736e7756---wubexubetumimefute.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/dodopimonalojututibu.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/51700042398.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/43132568369.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/bowiwemomuf.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/kibuwaberowew.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/mufexefozodoxix.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/tujewiriputofat.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/68570347121.pdfIn PDF document text
    • http://philboyd.com/77075331864.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/37414805802.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/rilidorijijatuzaduv.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/4370745463.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/83118620480.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fejeluzijanusaxanatil.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_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 19568 bytes
SHA-256: 15746505c7f3a171e5c7ba662e04141caa1b02e004421eef856eb1d4d8597bb4
font_01_sfnt_off00014489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA0 11256 bytes
SHA-256: cccb0bf482bb5be1b7410072b72dc31cd4510abfd541da753122c0d2627fdc9c