Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf755740025f08d…

MALICIOUS

PDF

68.4 KB Created: 2020-11-22 02:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 125c6579b260577c4eb9f6e366502a61 SHA-1: 2b5e3da363e86b0478e03d20604bded4d41b267c SHA-256: caf755740025f08d12b2834d30d52612df1b01b03f4f92b03419d817c84bbec6
154 Risk Score

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 0.9997

Heuristics 4

  • 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.
  • 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://ggtraff.ru/aws?utm_term=english+nursery+rhymes++mp4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f8e5238b0308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_5fae1d7fc338f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5f9a5a7ff0001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_5f985be891b7c.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/jebupofedijakuk/autoestima_automatica_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/anemia_dieta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0711e0f-e683-4aa2-a35d-e1259c6daa5b/textbook_of_paediatric_emergency_medicine_cameron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796ff901-a775-484a-9548-524840ee4bf9/70971013776.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/halloween_bingo_dauber_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/gattu_battu_theme_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/oregon_coast_trail_hiking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/autocad_2016_book_free.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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 5168 bytes
SHA-256: 09db5032edfd34e9eb51fd03439946d4d3957866d83fa6032e91d07a4b18b1fc
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 10804 bytes
SHA-256: cbfc6f2446d0a94e9ea34cc721e1fda9dcd428ae0626ee69df6e3b4f2c3fccb4