Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c24b748f3179dfe…

MALICIOUS

PDF

85.9 KB Created: 2021-01-06 14:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 36c79ad4b4bdd132db7ebc0f75dccf33 SHA-1: e4d27d5b54e586fe15dbbfd83a653ad153307ecb SHA-256: 8c24b748f3179dfe6c4c807efc276f8169b8ffdadabe39e20419019ad2c09c49
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains an embedded URL pointing to 'traffnew.ru', which is likely used for phishing or to download a secondary payload. The PDF structure itself does not contain readable content, but the presence of the external URI is a strong indicator of malicious intent.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/aws?utm_term=deped+ssg+constitution+and+bylaws+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5fa66d984b949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fb2c846a5f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_5fdb1fc201438.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/hgUhhfF/free_songs_ringtones_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f894e49dd283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fcb7794d1f8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424364/normal_5ff53b5d4452b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_5fb65bd5cef9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_5f95bb6b822d9.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/0480f4af-2824-4a3c-8884-1736003758af/35869778394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca0459f-a578-4f79-943a-1be7c792f612/1992_suzuki_lt230_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e302cb-e2b1-4180-b900-2e7110330a23/fidevasezunedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213e1147-a2e0-49f9-9379-e408b5145bff/fatuwenerulosem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98722f23-bf99-4653-a890-8cc730443a41/pinasalavazupiba.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_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 5560 bytes
SHA-256: 0a74bd37f81f791e3a711ba59ecb9badec0c1f8b794a51032ab67a699175702f
font_01_sfnt_off000126f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F2 10428 bytes
SHA-256: 21fb44ccd865137ed11c01e90d83380fb42ff25d0cc1f69264e8e426f6309f2d

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