Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6f585360b785bf…

MALICIOUS

PDF

86.0 KB Created: 2021-03-08 23:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d049e8b3dd61aa24ce4bfcc9faabc757 SHA-1: cfda49a6b28e36903fd25feed2a2568cd5051acb SHA-256: 8e6f585360b785bf0a202b151a9eae605672bbe272ffe922299abbe26d427f46
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 point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to redirect users to malicious content or phishing sites.

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 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.
  • 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://jacksth.ru/award?keyword=loi+binomiale+formule+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379960/normal_600328ee0a46e.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/repeletatemej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5ffa1eddb4d01.pdfIn PDF document text
    • http://businessoutsourcing.org/zemivazekulopali80iy1.pdfIn PDF document text
    • http://savadaqwe.space/music_streaming_software_for_androide36ds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373509/normal_5ff68fd6b9d41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486051/normal_6034f4888e527.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/xutiwexemi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_f1cf3e4c729d478288513aad9ff2a6d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubefula/java_swing_gui_builder_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/juferorogufu.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/futom.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_c7f11e560fb849309e51b847ac951af8.pdf?index=trueIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/twilight_new_moon_full_movie_in_hindi_download_480p_watch_online.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_4b5f2cce28ad4e2190937b65f8881f46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/39076104912.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/fupikabobu.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/lg_inverter_air_conditioner_error_codes_ch_38.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/consistency_test_of_cement_lab_report.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://scripts.sil.org/OFLIn 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_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 5092 bytes
SHA-256: 9ffd0358734bc9813a6bd9a5a1e50a366b49d2f32819f5bbede2d1a58ae35354
font_01_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 13552 bytes
SHA-256: 95c50ce23dbf697668db598a16ead7501079a1e85bd5819d47d2600e2d2aeda8
font_02_sfnt_off00013309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13309 16292 bytes
SHA-256: b70d0e8df73dbd4446b83cdf7293aa62f186843afa1a25b9718e1ce78d747977

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