Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3c9017e131510c…

MALICIOUS

PDF

67.6 KB Created: 2020-12-21 17:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ebe9903d965973279643f9abb9730905 SHA-1: d05493dff169a769d25d2293f9e2b096c928fac2 SHA-256: 3c3c9017e131510cabdad4518a95ab2d442390a9618f3b69eae1667ba1de4c79
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely as part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'Cthulhu realms expansion'. No scripts were extracted, but the presence of an external URI and the overall detection profile strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=cthulhu+realms+expansion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5fa1a879995e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_5fc078fa00c52.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/ff92f202-5fe7-4236-835a-e1a53f6d993b/85217220640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5e8df8-3759-4755-9855-5a79ee214f8e/tyrell_n6_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732a8b8a-3416-4e89-8eab-bbd15bf7bf3a/graphing_linear_inequalities_worksheet_answers_algebra_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fa18ce-4b67-4022-aec9-e27f2c728a50/tali_dova_glory_hole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7acd1023-338a-4db6-b414-3d021b6647a7/12280834378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1841f2-3ce7-4446-bbf0-dc98825c15c9/tivebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce761da-0e31-4004-8255-1f07ce377064/fluidmaster_model_300_replacement_parts.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc553ca11f6a41984a31074/t/5fc753610623334b0c5e597d/1606898530200/37400724767.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/vivororab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a355565e-1128-4046-9d84-1344c5a966af/76976827781.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_off0000bf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF26 5032 bytes
SHA-256: 4132bbd406dac7adb145756f2e8f210769ab215e9aa9a3bb1d4917e487ed319d
font_01_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 10452 bytes
SHA-256: 2f787ae5db65c0a1be1b95cf480e563b766071730deda41cd4022d3f1858034c
font_02_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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