Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cc0d73a49dc11e…

MALICIOUS

PDF

71.4 KB Created: 2020-11-14 06:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f1939fa09b82cefca2feea4679fd2e6d SHA-1: 777238209e151de83c462c9d2b4bbdfd5a75118c SHA-256: 38cc0d73a49dc11e128345b3632db809c122a21d2858b46a84861305251a2269
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 suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URL point towards a malicious payload delivery mechanism, likely initiated via spearphishing.

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://traffmen.ru/123?utm_term=gamo+silent+cat+air+rifle+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5faf57c8e575d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f99e5bbe68b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_5fab5d09325ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f8d2139bc4f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_5f9e361dbbc2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f89c5e0073db.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/385255d5-8e50-467e-9b11-5458b1e0213d/durasimuboxige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434c42f3-5cac-4bdf-b1cd-83882a4748f7/86278706254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2796de-8f94-4282-929d-d13d2737db75/xebazirexoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f59d465-52f6-49aa-97b6-35c38e26031a/dimanazutosedubimon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b0c2dc-0e32-4b7a-b2cf-7549c80ddad7/60592637061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8406aab8-5155-4156-9c5c-1aa264ee0836/jupefuzitapabekizafolekaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a33b84-87ef-4242-a422-30ba1e23835c/29773868502.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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 5056 bytes
SHA-256: e29d8e5de23c369ea73ed2b8caff47ee7493951b59dca6411e5b9856fc7728fa
font_01_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 11272 bytes
SHA-256: 15377e40f3a97112282535a2ed98aa355b797c9839e6144828edb758dd694c50

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