Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6a6b6af7967aaf…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 23:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58342c4b3d65615b483cd36209f05a4e SHA-1: 40fc8bc94d710395f2a6fb9f1df7abbef4772d04 SHA-256: da6a6b6af7967aaf012db8b9a1d3b8fe76cd8396cc9abeb01585dc2b5850044b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to benign-looking documents, but one key URL, 'https://vilenefex.ru/wix?keyword=uh+writing+center+staff', is flagged as unknown. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or distribution point. ClamAV detection and the ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=uh+writing+center+staff
    • http://sdfsdfsdf.shaketorch.com/eworksheets_point_of_view.pdf
    • https://cdn.sqhk.co/kinanunir/ehjiePo/99964883281.pdf
    • https://cdn.sqhk.co/rapurakoke/IaYUCje/skylanders_spyro_s_adventure_xbox_one.pdf
    • https://cdn.sqhk.co/rogudokives/xsDthc9/descargar_ultimate_epic_battle_simulator_2020.pdf
    • http://sozefavi.22web.org/kia_optima_2013_owners_manual.pdf
    • https://cdn.sqhk.co/segenapiza/jbje8I9/30567670161.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafirawit/mirugowimamupudatedi.pdf
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_ddbea44d87204be2aae4c2dc777279bc.pdf?index=true
    • http://duxurulokij.epizy.com/how_to_download_audacity_on_mac_2020.pdf
    • https://s3.amazonaws.com/feseni/zoology_notes.pdf
    • http://vurisadazuxe.epizy.com/54576097277.pdf
    • https://s3.amazonaws.com/banula/madurowarolagix.pdf
    • https://s3.amazonaws.com/wejuvono/camstudio_full_version_for_windows_10.pdf
    • https://s3.amazonaws.com/kozewuposoridil/sheets_linen_vs_cotton.pdf
    • https://s3.amazonaws.com/fajetufekejo/sobot.pdf
    • https://s3.amazonaws.com/pubopelej/87440277645.pdf
    • http://ninamivekadod.epizy.com/72674511766.pdf
    • https://s3.amazonaws.com/xifabilejilab/solo_vpn_pc.pdf
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_5f8691068ede4b1ab58032b5a52f75ef.pdf?index=true
    • https://s3.amazonaws.com/faxaxos/75202613763.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_9e6a89eb516a4ae4af5ddcab887f38e4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafd.bin
0dc5176456b36e477859929fe5e9b197688135dd565d024283ef800a717272d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 5196 bytes
font_01_sfnt_off0000fcc1.bin
242c158c7d813e0b5a60cc42b3ab8ecafb546b23ffda93e2da8bead10227d185		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 11084 bytes

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