Malicious PDF — malware analysis report

Static analysis result for SHA-256 f415fc230a5ab982…

MALICIOUS

PDF

71.6 KB Created: 2021-03-12 13:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9d6967ed17280ce4ac9b635be4aeb4a2 SHA-1: 457cf4b0f0dd462ff5d1bcc9491831cc4710f353 SHA-256: f415fc230a5ab982fbc8e3a9a28c06b3f2bec2612bb63bfb6e08f6df99f116a4
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting an attempt to obscure the true malicious destination. The document body, though heavily obfuscated, contains metadata related to its creation, which does not provide further insight into its malicious intent beyond the presence of external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=neurociencia+explorando+el+cerebro+pdf PDF link annotation
    • https://cdn.sqhk.co/nuzitomizaj/yieZ0Ac/2531160391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_6047cf0ec9f6a.pdfIn PDF document text
    • https://cdn.sqhk.co/rogekanus/hhgsidK/find_object_in_all_databases_sql_server.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/the_saddest_song_on_tiktok.pdfIn PDF document text
    • http://molufipet.sportsontheweb.net/weekly_menu_planner.pdfIn PDF document text
    • https://cdn.sqhk.co/sisamide/jctigjd/31497226359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5ff0ea8f2aeb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_603e731397771.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/91313455333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482413/normal_604639dfcf50f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_6023d8ffdc083.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/11794403946.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/51989394196.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_d45e41ac775748f19560df45a5fdbf56.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_a4ce035293224c76b5c6f062be6f6093.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/jewotisozonibuxusosure.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_0efce63b735e4123919349cbc8fc6dd7.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_92d1556db41c4869a2f2f8fc4c94ec3b.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 5148 bytes
SHA-256: 62b54cc3421c77fa73e7ff5d22cc82b61ad3c54388f8f3b28b8c28198ce7c255
font_01_sfnt_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 11580 bytes
SHA-256: f8de9252f73da9365ea5e24a13367f7d309575ef60b890eeb62e84364cee3e83

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