Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e5c7af36264d1…

MALICIOUS

PDF

77.9 KB Created: 2021-04-04 13:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f050b04d129c19ee4b7872b5f0d1b57 SHA-1: d9eb455bc790e6b9279f041025efba4032848c93 SHA-256: 4a1e5c7af36264d1f80d6ddc12cf32dbb7cc52dac65a1413f4845947ecdaa2aa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit users' trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=wiiflow+wbfs+sd+card
    • https://cdn.sqhk.co/rudugebakivo/7mgjgfD/krita_environment_brushes_free_download.pdf
    • https://cdn.sqhk.co/fematixub/egjjeie/18137492282.pdf
    • http://wide-take.top/coaching_agile_teams_a_companion_for_scrummasterso2af1.pdf
    • http://true-board1.club/sagegosizrughd.pdf
    • https://cdn.sqhk.co/butiluluvuk/FibVLif/2_4-_dinitrophenylhydrazine_reaction_with_formaldehyde.pdf
    • http://podcard2020.site/24151075058qfi2r.pdf
    • http://calipshatngaccs1.xyz/mitewewafhe5.pdf
    • http://padlamadla.site/german_verbsng3e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_4f6a7facbe1f434d8c2f490eabaa4f66.pdf?index=true
    • https://s3.amazonaws.com/radubozufiwo/sabunoragukugetekuwelajag.pdf
    • https://s3.amazonaws.com/gumagabu/33324697745.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/microsoft_access_2007_crack.pdf
    • https://uploads.strikinglycdn.com/files/383f1c18-520f-4f46-ad9b-75fa1875c925/whirlpool_refrigerator_reset_water_filter_indicator.pdf
    • https://uploads.strikinglycdn.com/files/d92a9e53-3a9a-4a2f-8931-525dbec4077c/what_is_the_symbol_for_dow_jones_industrial_average.pdf
    • https://s3.amazonaws.com/medaliwifufugel/budismo_moderno_libro.pdf
    • https://s3.amazonaws.com/tizowodifi/dark_mode_messenger_android_2019.pdf
    • https://uploads.strikinglycdn.com/files/381740fc-4f3d-4b47-8b19-bf49653e73fd/94661755172.pdf
    • https://s3.amazonaws.com/dedinavesute/dukilewiramozajini.pdf
    • https://s3.amazonaws.com/julexekubaj/aarambam_tamil_song_free.pdf
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_1cafa4ade84a4620b8fa35c3d31698d6.pdf?index=true
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_0047ec89e65a4627b4c800623b82bbc3.pdf?index=true
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_ab88bc6af7ee472e90d0b3dac3f4e4ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3fa156b-5abc-4563-9eac-629f8b9619a5/5872364359.pdf
    • https://s3.amazonaws.com/wetowuzuxit/malaysia_airlines_annual_report_2018.pdf
    • 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_off0000f2dd.bin
856c5ea5513b82750f488ce1d2d266da7ad784eaac8ff31009ba817595b8de04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 5260 bytes
font_01_sfnt_off000104e8.bin
d0a50d9d607091e3f8b120adfc3c33b9f0ce599203087ef29efef6290d715d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 11488 bytes

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