Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13d83aa4c8fe628…

MALICIOUS

PDF

80.0 KB Created: 2020-11-29 02:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cfbace7fbb59edee7cf81684a2742f53 SHA-1: 9dee6c657c7e2a97b17242d954e764af4d869f34 SHA-256: d13d83aa4c8fe62890d2986ecf3b66204c5ef8f94795a0aa9f138eff75a5c671
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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/strik?utm_term=zelda+four+swords+manga In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424637/normal_5fa465bf1bc25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421056/normal_5f9d797c0e6fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fa8fa0a04f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_5fbab145605e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_5f97ab6b96b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5f99b126be4be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5fbc65e597c3a.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/e961aa86-841e-48b7-8e4f-1272df9fad79/49828907890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee55aae-cd79-4d95-a355-c6eae0f17cd8/cer_practice_worksheet_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/wind_turbine_lab_report_osu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c740619b-58dd-40a0-8887-ebd7dc104895/mulemitovugoroxenesuva.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 3468 bytes
SHA-256: 2a26ae626bc3704ffbe2a540b4399042b7303ccdc8c6e572ee2e7d9d9e7500a2
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 5032 bytes
SHA-256: 5eb863a6ae3002e8d46d064b144553babd4f3b0b0d461f8af8f65a2224661640
font_02_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 11320 bytes
SHA-256: 53b888f77e47216766aebe967fe2b1d588f8459493631602bb41e7630443d92d
font_03_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 17452 bytes
SHA-256: d2dd8cb134ea3ea31b6595edfdf4fcae6fe0d259fba5feb9851c9bba4382c56f
font_04_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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