Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d16098cee9188a…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 02:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d7a393f4f4981bb109915c12157f6eb7 SHA-1: 7da4c06b05239fffc45f464a84c671dfc9f2f88c SHA-256: e6d16098cee9188a19326965592dd04a457f0401079fcc5c9b06d757838f8796
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as link farms pointing to disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external links suggests an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=asphalt+8+airborne+old+version PDF link annotation
    • http://studionegrelli.it/userfiles/files/nikuburi.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/60749928374.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/vegavowavixurapafo.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/pupos.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/fuxalevurefobozet.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/1447807888.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/23532376398.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/vobitaxi.pdfIn PDF document text
    • https://citronel.com/userfiles/files/zopexazuletesavamowelu.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/61506773249.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/75242894495.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/40319582740.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/77364008807.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/nugazogepevagenawasewam.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/51781328973.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/ketivosowimuviz.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/buvezoj.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/23657640958.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/67828652904.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/sakaxev.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/sajapavowimijogejo.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dumilukev.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/ruvamep.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_off0000ad2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 10884 bytes
SHA-256: 3564c2a6f14355d0b8573b3e04df6f2e310ae24f6a2c3db4cfb3fa12ea0bec3e
font_02_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 15460 bytes
SHA-256: 1e57863de757ba35a0c3ccda43be53e8ee984a9aba9e19d16368cef7fa1e2af2

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