Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fb3a322f7db033…

MALICIOUS

PDF

81.2 KB Created: 2021-01-03 11:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9f7ad7718e84afe62328054f5db75418 SHA-1: 793c5e7c5450c16e57d852b3829a9f5987170f6e SHA-256: e9fb3a322f7db0336bf4b87298671d4283d0c8c572a908d08e907631e3d17896
104 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a domain associated with malicious activity, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF. The document body, though heavily obfuscated, suggests a lure related to 'calligraphy printable sheets', likely a pretext to disguise the malicious intent of downloading a secondary payload.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/aws?utm_term=calligraphy+printable+sheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5f9d855748f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5fdb528d0f9b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376096/normal_5fe5976e3c2e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f872f4ed5703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_5fa1652e543c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366008/normal_5fe1390d1a696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fcf5f7d7599d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5fb8e056dc3c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5fccaa1ebc479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_5fa5ffe462a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fa6586055183.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/juzowilipi/71176951233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed7d662f-f5d2-41be-8355-e9092c6a0514/rodelalakipajewapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecbdc56-7530-4892-96dc-1fb67fc2bfb9/sapurubitimiloxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ae5ff2-f7db-4dcf-8466-f5a9ffe73360/wepibiwupakasekuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4adb2515-1e01-4bbf-8361-722f37226a85/zimurotipoto.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_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 5228 bytes
SHA-256: 35df29e8ac0513bfc1303245281975178b6743fe74e07f44dad80e06a138a8b0
font_01_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 11180 bytes
SHA-256: 63448be29eb558f2a508ee939a8940353272d666ee505ace4b4b8e962d8dae20

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