Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fcac1c548e7c2d…

MALICIOUS

PDF

67.3 KB Created: 2020-12-06 17:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6cd26f69d638ab83b2c240872c9755c3 SHA-1: e5954adfb3bb0537f3411b694d01d57f8c3139a8 SHA-256: b2fcac1c548e7c2db5bb3052912c4cef858d063c53f2ae82c541d2fc2fa4db2a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafftec.ru', which is likely part of a phishing campaign. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URL suggest an attempt to trick the user into navigating to a malicious 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://trafftec.ru/aws?utm_term=anthem+bcbs+fep+prior+authorization+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409811/normal_5fa0a383d8b4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_5fcaef8c27c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_5fbc725a5d7ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_5fbeaca787deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f96f9d960ba6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc552cfab79f442f246e6cc/t/5fc90f30f8b1525102918573/1607012146829/kuluruwemebijet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35fedb85-a8e2-4a83-9bb3-aa4f9b6622f0/nujivetuguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1a38ea-c5db-485f-b40a-1f7abdf03b5c/words_that_rhyme_with_planner.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/gipurapor.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6fa158651a04751952937/t/5fc93faa84a95547e44d3de9/1607024554486/amc_schedule_christmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6042cf83-09e7-4a6d-b060-d144afe0e986/nubemijorokegon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd008c14dfd36feeb1b6e/t/5fc0ecf83485235c86e80fe5/1606479096494/aereni_high_elf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6bc89d79364840869816/1606380489328/34056439848.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_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 5404 bytes
SHA-256: 6ef7cf8ca42f2f38afc290a58914a179c2d2da98cbcc63172e0ffeb574b74991
font_01_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 10092 bytes
SHA-256: db733d31e3f49ef12c211b9d4f0374416ae448ddce8e6618e63f4a4cff69a732

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