Malicious PDF — malware analysis report

Static analysis result for SHA-256 931a8fd3e0899513…

MALICIOUS

PDF

79.5 KB Created: 2021-03-11 14:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ec7ff88566e90139a25640d3c523d1cb SHA-1: c908f238bec7795a86e8dfb815cb6675b5818d51 SHA-256: 931a8fd3e089951349d7b9c1ba038e77ebbdb1d854f0b00a524b46c223136d14
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of the external URI and the high confidence scores from multiple detection engines indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://ponafet.ru/award?keyword=bc+fire+code+2020+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445338/normal_5fca6e7c6832f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_602c2d9f69fa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481163/normal_5fee64497e3fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_5fc88aab3477e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/36b3cd0b-2f04-4b56-b58c-c25f82f32472/skilsaw_12a_circular_saw_7-1_4-in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa98301-5f9d-46ef-a406-e59e57db808c/battery_tender_jr_vs_harbor_freight.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/bluebird_naruto_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d1b3c4-b0b0-4b58-85a8-5a087127ad75/what_is_the_role_of_o2_in_oxidative_phosphorylation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bbb306-3674-4e68-aced-cea5cfc8fa3e/how_much_does_gre_exam_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/410_vs_411_gears.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/kufizuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cdd2940-336c-4d68-95ea-d2bafd1807af/6928352839.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/60917813137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e34088-a171-457f-abe1-a2db90f85525/80684811336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26eb24b-2065-44a7-af56-7c85a11c906b/the_elusive_quest_for_growth_by_william_easterly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c43856-0cfe-4f51-b891-4ee289240393/what_is_uk_employment_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3d39f4-5f2b-4bbd-9940-7a285eed5b92/26310250373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe173699-ecc6-4931-a3ad-4f2f6de00acc/66742839267.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/zosor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cdd72b8-617d-42ce-8a5c-cd89d4c01285/what_does_bug_mean_in_computer_terms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d71123-6cea-4ac5-ad9d-1aa8cdb9e14c/20636715726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e4cc35-4f3a-4b95-9d1b-abb821b74546/vupebuvupal.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/44137890706.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 4652 bytes
SHA-256: 7c63b612a9a50034f98d425df0b3d2d293ca9de4c866ffbd1c46136b1595f6f1
font_01_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 10656 bytes
SHA-256: 323cd690b3987470e53f93ace174dfabeebe7d6fe66ed8c8921421e0ee828242
font_02_sfnt_off000122ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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