Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c234ffe9c898e2…

MALICIOUS

PDF

63.1 KB Created: 2020-12-19 17:25:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ee40060a931e4157ae61b7e75371bb05 SHA-1: 11dbdc8f1cd43312b917caa7c9cecc3a49e25bf6 SHA-256: 37c234ffe9c898e2fb41060b809a9632399047dd660442ff1beed431392365f9
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to opening a sprinkler valve, likely a lure. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=manually+open+sprinkler+valve In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5fb8c14e2734f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_5fb6d917d0b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5f92714eb8fef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f910a4898c58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_5faec95b5021b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461483/normal_5fa1516b0d89d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453563/normal_5fc6b19f193e0.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/zabejuvijolu/salem_witch_trials_documentary_history_channel_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/zabesemesuxapemokepuluf.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/verb_to_be_affirmative_negative_interrogative.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/miata_steering_wheel_cover_size.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/kiwuboxarekizuwesob.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_off0000bb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB71 5044 bytes
SHA-256: db9e4d9f86716c3bc9afd4ee72389d5efe2ab5027147f2c9d519a62926e179ba
font_01_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 10268 bytes
SHA-256: 6634e6b92e8f2dab1f052ffbd4b79d76f5624c084aa8baef32c5d45a49b20783