Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ad2c65f44f8945…

MALICIOUS

PDF

70.3 KB Created: 2020-12-08 16:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7873938779ec0753b26d313e74a35f88 SHA-1: 32a76edcd7d4cf76bf40d1fa87738c4a75a4d637 SHA-256: 83ad2c65f44f89454f0c3c44046b4c393442ae25340a2f1cc4435ac63ad8b600
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, trafffi.ru. ClamAV and an ML classifier also flagged this file as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but the presence of the external URI strongly suggests a phishing attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 4

  • 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://trafffi.ru/123?utm_term=on+behalf+of+me PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddd3404-eef1-4dea-ba6a-ea14a313c17f/98940186728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ecd837-8804-4b58-9909-73df70821ca8/73955701691.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/65417786571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65949c97-62e2-45c5-a1a8-863bc38cdd6f/karasidudafobado.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/iflix_app_for_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3aed99955c744b54ce5b8/t/5fc46eb108845d092417e2e8/1606708913466/beauty_angel_rvt_30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d1a2dc-ca4f-45ac-85c3-5b53076fb4ce/81188580941.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/81476323608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c073dd9-a87f-4ca2-bfa1-0e0f7041409d/aye_and_gomorrah_audio.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea21c30a162e0c52977d/t/5fc23af7f8cdb769c62d80e0/1606564599257/77506213446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d52f97-5f42-4d4c-9601-01e074436831/jirenovapepupixuvonuro.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_off0000c17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17F 4900 bytes
SHA-256: 28c9dbfc348527dcd1d4eb9103bb7b12b0ac8094ecf7ab49428461e7760152c1
font_01_sfnt_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 11444 bytes
SHA-256: f50fbd0b7251b0e008d7f05cc80641121f45315fc9dbc5433f2268d428c9b6c3
font_02_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 16112 bytes
SHA-256: 60be99727b902659c7fafa65754ec3110ad4ab0ec31f2cdbddf0b1ba1d5aa292

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