Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5b8c408f15cc7a…

MALICIOUS

PDF

68.8 KB Created: 2020-11-18 21:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a36dbb775c565eff5ac02f9a957e5a50 SHA-1: 1cffa91309fa3d0d0201fedaca4bab1c6431c371 SHA-256: 0a5b8c408f15cc7ab0fb7415b0319c5eec690ea38325884e9f9e2628600df93b
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 a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support this assessment. Although no scripts were extracted, the presence of a malicious URL and the document's metadata suggest a phishing lure disguised as information about a student desk.

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=student+computer+desk+with+drawers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405662/normal_5f9c4bd464232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f899f0c4e502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f875a6145079.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/leguvefu/building_drawing_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/descriptive_words_and_phrases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99075da4-d969-4ffe-aa8d-7e01e0febe99/55811167848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79d6485-6c8f-4ef1-8ecf-8b4f33ae6a83/barevexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9260b0-fc9e-46da-ad3b-aa3100712517/33951821004.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/37230477040.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/gastric_distention_icd_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f761971-b137-457d-a3c1-41c8e7d63f70/turiguriwopedazagoso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 5540 bytes
SHA-256: 977fc5a084cfecf049cb106683a7a1baa7c66c7b9d32f933d7ef2c4264c8311d
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 2052 bytes
SHA-256: f71a47484c95d7a8a65244bd51e38c405cd89f9b07b6a5ad15c9a573391ef875
font_02_sfnt_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 10460 bytes
SHA-256: 0e7eadc653bc4dfe6cc2b92fbfc3849af9a78ef5c34e45a1602471c9a282c8a1

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