Malicious PDF — malware analysis report

Static analysis result for SHA-256 d372f77ac4dc9845…

MALICIOUS

PDF

71.4 KB Created: 2020-12-11 02:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bcb7af88576ad5ba5a279bdd449e5b42 SHA-1: 29415d7fafa55878a24b230b9f3d3bf765ef7f0d SHA-256: d372f77ac4dc98459e9c8264c5745e4450e9a4a33c8360d8c8f7bbff6b56ffd1
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a domain associated with phishing, and the document's metadata suggests it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The document body, though heavily obfuscated, contains references to 'customer service resume cover letter template', suggesting a social engineering lure.

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://trafffi.ru/aws?utm_term=customer+service+resume+cover+letter+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498345/normal_5fbcf6c46e360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416929/normal_5fad89dfe4007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_5fba52dce3589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fd1f6c929039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_5fa73abe7fff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5fa4e49c22d8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fd2a4c853592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_5f988a93cc6ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/41861617-45fc-4cc2-b41c-54225de0a024/siberian_huskies_for_sale_in_georgia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9b0f54-f085-4c35-949b-fdc4f9986882/8515706934.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57fd5affbf90a6609a074/t/5fcb0b2e1415195da07eb218/1607142192288/dinosaur_world_ky_coupons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95752d6d-c68f-4f89-ba56-5bffb872dcbc/relubinomubejalum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4022b6b3-aa9b-4530-97d9-950fb115689f/53679034281.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 4940 bytes
SHA-256: 0dbfd5d62292d58aa18aebdfba527c07f1e077ac62960fd7b338b1cd232bdb2f
font_01_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 9876 bytes
SHA-256: 1591794b9ab1eb1f45540a6fbd351af9c9b14d376bb80f1d19e33de13e972210
font_02_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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