Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25b18301b60ab70…

MALICIOUS

PDF

71.8 KB Created: 2020-12-18 14:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f52285bb56cc26f32830146fda123c1f SHA-1: ee22c15d5a4347da377a06067e5ebd421564e384 SHA-256: a25b18301b60ab708bb23ca458bbbf3985bb69bb113c89046ec402b503dcd47c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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/aws?utm_term=khmer+songs+sheet+music'. The ML classifier also flagged this PDF with a high probability of being malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, consistent with phishing or malware delivery via a spearphishing attachment.

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://cctraff.ru/aws?utm_term=khmer+songs+sheet+music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fd61353e85ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fcf603f5e1fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fb3d75a198fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5fbb620333009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f9a96d401742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_5f99d0f45eaec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5fb5f0876218d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5fb4569889ec8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe012e537a05ef0995e2/t/5fc1d2c618e72e5fdb1b12d1/1606537927888/manual_cafetera_krups_xp1020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1ea776-e243-446f-ad76-89f8d2ca1f68/vinyl_to_mp3_recording.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5aba47d0c8f249d617a7e/t/5fcdb24ae43f2b00a8c6c9fd/1607316044578/occupational_therapist_assistant_salary_florida.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd228ba28eb857557e1342/1606230667741/fotifunokuwebosivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1cd1ae-c52e-4164-a51c-4ae3f3182974/nunesomopiva.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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 4940 bytes
SHA-256: 9b4e3886a1551fd9f66dd8adcedb2bf65f0ed59ff3bd2d2f46ef15d1618edaf2
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 10336 bytes
SHA-256: 837cb228fc0e107dcd15ec68fcc0492eeb110ed8e13c433555628b786b496e38

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