Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c403ac31fa966cd…

MALICIOUS

PDF

69.3 KB Created: 2020-12-01 13:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1f1860cc52a3930df8327b452ef25f0b SHA-1: a090853e1fbfe6b755b575c7a3abdf8c76770d91 SHA-256: 2c403ac31fa966cd30f5808dc06ce5fcd2a9be23edde21632bd438ef9c7ae8bc
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=torkom+saraydarian+books+pdf+download'. This, combined with ML classification and ClamAV detection, strongly indicates a malicious intent. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a date, suggesting it might be a lure disguised as a document. No scripts were extracted, but the presence of a malicious URL is the primary indicator of compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/123?utm_term=torkom+saraydarian+books+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_5fb9f860577f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448538/normal_5fa4819cecba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5f9292c56a76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5f9cedbe59de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5fc5b140bef2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fa09d5f22568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5fae4cb12ce1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f8770eb4185f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f885f559c516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f8b6f35a2f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454807/normal_5fbc6c6b787a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/milanasikolabom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3659a7c7-7186-44f7-b80f-b3a84039cc0f/florida_elt_list_of_providers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11a4c405d5340f32abf29/t/5fc5b56461e25426e1fd6923/1606792550499/60282742684.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5ca84e98326c0207fb64/1606376618511/forano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6de069-cf67-4d90-b1c1-5d06e2910b9a/emt_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/rakuv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 5536 bytes
SHA-256: 7f8998b8c28ec1b636ccb711a6f37dd8129c54e7e2f6494c5ed527ec266488aa
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 10688 bytes
SHA-256: 2ef1ec328e40d169d4579dcd6337cb60ec0fe15ff19adf2af184a535491e2765

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