Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d56849eadd0cf8c…

MALICIOUS

PDF

68.2 KB Created: 2020-12-02 17:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 26aa074f1b7e72de53db93a0abf45ec9 SHA-1: 3935f5d0222445584ea0017c939287635115d8f5 SHA-256: 5d56849eadd0cf8cfa0c42545ba1085b275198ea34abd53d8cd74206bd222f6e
154 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://cctraff.ru/123?utm_term=spider+web+graphic+organizer+pdf'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier and ClamAV detection further support the malicious nature of this file. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=spider+web+graphic+organizer+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5f8ef23fafa24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_5fa2a64c23a17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_5fb8b854b48bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5fb41dc63d557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f8937d2305be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fba5fe5429a3.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/wusigipufuvowix/funny_girl_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adad9491-258d-490e-a07f-75a7dc01e6a0/watch_hd_movies_putlocker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd36c49-b285-4677-a1b2-38bfd44154c4/susozomemali.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/99455381091.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/classification_of_sedimentary_rocks_worksheet_14.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_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 5592 bytes
SHA-256: d46d0ee19f83464b63aa500768d99d8b52303d9f66a33ba137b19258bb455afa
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 10680 bytes
SHA-256: f3efffb414aaff0b3fc7a7786ef942bd109f469b27a8bfd601e09a803ff2e4ab