Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a81ebf3109b38f…

MALICIOUS

PDF

78.3 KB Created: 2020-12-14 15:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 064f560b129dc326d301c0f0a144d71a SHA-1: ec9c801beeb61c69974525ad384637c3e424fe4b SHA-256: 04a81ebf3109b38f511b6cc0be6efb60af2d88c0ba4cd45163c1b660d09216b3
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URL pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The document body, though heavily obfuscated, suggests a lure related to communication, which is consistent with phishing or scam tactics. The presence of the external URI and the ML classification strongly indicate a malicious intent to redirect users to a harmful site.

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://traffset.ru/aws?utm_term=formas+de+comunicarse+asertivamente PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409095/normal_5fc6fff1c8a79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fcb9c5d0a1d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f998b7a38dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469645/normal_5fa595d223168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5f8d0c717df7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5fb030752f088.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/c96f5fbc-1716-4b99-add9-acf52b48a041/menod.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/89735757258.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/57213472794.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57b2d6609fd0ee7b07d3c/t/5fc7f823926543238a61bb6f/1606940707894/75338044509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2102c98-6a89-449b-ac8c-1a3f6f40d0cd/62896807377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b85bd78-db54-4381-8cc8-4d7ea74780e4/praxis_ii_biology_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dafalebinoza/printable_learning_styles_inventory_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/14715879635.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/adventure_communist_apk.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_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 5068 bytes
SHA-256: 1f2ff2876306d5dbdfe2570b03a2d4771423e1fe52b6ffc492f25e0b655e4999
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 11908 bytes
SHA-256: b24f84bbcbc7b3436d64d18d8f16b9ac8ab224bf68db9c79f7f592db02cadad3

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