Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f20dc27bc87c264…

MALICIOUS

PDF

70.4 KB Created: 2021-01-25 21:35:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 115955e8e9bc8e2cb5c51bdb25617d7b SHA-1: 0c1db5a85263f049157db9253bfc2c3955af5d69 SHA-256: 4f20dc27bc87c2640ea63f4f8fe8e6ea734c7d275d2bc31f3e2f2cca192a7ff3
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://traffset.ru/aws?utm_term=grade+7+math+worksheets+algebra+word+problems', suggesting a phishing or malware distribution attempt. The document body appears to be garbled, but the presence of the external URI and the high risk score indicate a malicious intent to redirect the user.

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=grade+7+math+worksheets+algebra+word+problems PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449184/normal_5fd05aa1e2586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5feb0781a44bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451212/normal_5fc6ab6428ebb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446492/normal_5ff38e4081a0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365642/normal_5ff0f66e570af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_5fe9c70d02696.pdfIn PDF document text
    • http://sellforce.ru/black_friday_iphone_deals_2019_uk_apple9fxap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5fec96636e825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5fe8e864841ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://batalogafoma.epizy.com/hajj_guide_book_in_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/pirusap.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/broken_roads_movie_parents_guide.pdfIn PDF document text
    • http://nepanazunisemi.epizy.com/5613041984.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/34204087784.pdfIn PDF document text
    • http://bugudejekizukem.epizy.com/ncrec_measuring_guidelines.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_off0000d3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 5780 bytes
SHA-256: 93b801eac3f5783d3be832b1b9ad573e6c1836b9b2cee815bd8ff68fa463aaec
font_01_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 10876 bytes
SHA-256: 6812ebaa7e63bf42f41ae72349601a4dc005e38097c5107ab7de115c4584dbe1

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