Malicious PDF — malware analysis report

Static analysis result for SHA-256 361b4871deebe829…

MALICIOUS

PDF

71.9 KB Created: 2021-01-04 05:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0a5946127e9b82907dcdec09794100d8 SHA-1: c9f04276a9d9dc91c3fa25ff97cc3572570b3ac0 SHA-256: 361b4871deebe829df41ff1fa588ab0cedd8f56796995e9d25143654214cd9f5
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, specifically pointing to 'ggtraff.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL embedded within the document, disguised as an assignment, strongly suggests a phishing or malware distribution attempt.

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/123?utm_term=evidence+of+chemical+reactions+assignment In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8e9c8cac65f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f8b6ff65d662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_5f9c724242490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f8e305762cf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ae37ea-b601-4a24-abe1-d66da7371af2/davasokosovu.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/88150145810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273dea45-2bce-4f8d-9425-dffbc845baf4/jspdf_autotable_add_footer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4a2cad-fbc1-4fc0-ac6c-9366a37dc79c/5e_oath_of_ancients_gods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee0a9ba-4998-44d2-9b43-dde75b61c304/69263833012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32268376-36ff-40cf-883e-a045d3d985d1/kuruke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c7f876a-d98f-4a95-9322-65949895a755/xuruxanadiv.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_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 5452 bytes
SHA-256: 725212454a833d04918e51abb382258f9e0111d088712f4830b5b2ff6817f3ee
font_01_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 10416 bytes
SHA-256: 649256155ad80313d48af8346d4f33cc86bee55bef7ebcb79d47bb38c725e77d

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