Malicious PDF — malware analysis report

Static analysis result for SHA-256 6735f863470a3a64…

MALICIOUS

PDF

77.6 KB Created: 2021-02-26 10:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d5c332255aa88b18d491ba5f6a5b50a1 SHA-1: fdcdd9539ba7c5284e548f2a0c6a662f5b2daeed SHA-256: 6735f863470a3a64d97ba2d87a6f9df44938cb597875e906b043386fc4bab8eb
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating a payment redirection lure, suggesting it's part of a business email compromise campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt to trick users into making fraudulent payments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://druttle.ru/123?utm_term=how+to+make+cowl+neck+hoodie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411923/normal_5fee72c20d18c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_60123a688590b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_6034307fc43b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_6027c1735c0f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_5ff375c6357b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6016ebda7937f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5ff696a333151.pdfIn PDF document text
    • http://sfhgfje5df.xyz/song_of_solomon_sparknotes_chapter_580tmv.pdfIn PDF document text
    • http://copyright-securityx.com/kujafikozifujukuserisuwovk85jb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501360/normal_5fcad98d09ccd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412588/normal_5ff90433db48f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fcaa521ccc85.pdfIn PDF document text
    • http://grenkasalo4.xyz/30697052134xlrzz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5fca6a5de7743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/what_is_social_constructionism_in_qualitative_research.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/sample_blood_test_report_of_typhoid.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/lifemevanejinojutoxojopan.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/android_19_dokkan_ultimate_clash.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_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 5024 bytes
SHA-256: 3d244d17d84fcc492d8616aaf3b139388aae983bfdca770c717e2fe800dd39e8
font_01_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 11016 bytes
SHA-256: 8f2c94503448a52a9ef9be62cbc79881d36a478534ededbaa6e23db19a561232

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