Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f457d4f33c6afd…

MALICIOUS

PDF

68.5 KB Created: 2020-12-14 22:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e0014843f894a367bae4e0c4f01eb3b2 SHA-1: 746c02e9bafdaec0f6191ece516fe08a9d4ef426 SHA-256: 52f457d4f33c6afd9a6505fcbafe91022fd64b4686e7c70c419d35626deda0a6
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, traffnew.ru, which is likely used for phishing or malware distribution. The document body is heavily obfuscated, but the presence of the external URI and the overall detection scores strongly suggest a phishing attack.

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=nih+biographical+sketch+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f87fe0e4f311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383574/normal_5fc5914875a8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5fb9baa2a3d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fbdc6102504b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f95e4006c305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5f9f74e011845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5f943aa00a666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f8f5d6c4bdeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485157/normal_5fd1000c40dd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5fa8d0a2733ad.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/a7eabde8-2413-4d07-bd0b-bb348757c187/the_merciless_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ee7a9b-1dbf-4dec-9419-7d07b91167fd/sikafusemalotu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5aa7fd26ff1194f946b85/t/5fd625c45488895576a3e74a/1607869892238/google_spreadsheet_inventory_management.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/88333650572.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6675ec14dfd36fe172514/t/5fcc8e34eb18547f4b7eec5d/1607241272358/91810778533.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/siludegulibopafopojexo.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_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 5508 bytes
SHA-256: 1bcbc0c3e0a8aefd34d0e65e6ec5cea960e538bb5ef1ca237ef9eaaf0331aca1
font_01_sfnt_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 11568 bytes
SHA-256: ed5d5ea649962e121349690ef56907b2b2a5e53bb19ed6510708cf62b8c4f5c9

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