Malicious PDF — malware analysis report

Static analysis result for SHA-256 9279f0ab033aa9f3…

MALICIOUS

PDF

79.6 KB Created: 2021-01-29 12:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f72be60702900d7466dd9b2ef0035cda SHA-1: 9f7723f8b94e08411b3b4fd18198342ddf6bcb74 SHA-256: 9279f0ab033aa9f34d8a3001029febf12b2c3cc39da2bef6e429509ec202b3d3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, indicative of a link farm or redirection scheme, and one of the URLs points to a potentially malicious domain. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to malicious content or phishing pages.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation 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://jottigo.ru/aws?utm_term=air+fryer+healthy+recipes+pdf PDF link annotation
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/7280187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_5fd1e215b22b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_6002152d2ff8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5ff64ebe082e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425507/normal_6007cdeea7ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_6009e8f4b06c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490539/normal_5ff09727d8a34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412775/normal_5ff64bbbe8a7b.pdfIn PDF document text
    • https://fujareke.weebly.com/uploads/1/3/5/3/135391043/5566556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_5ff9d019257c2.pdfIn PDF document text
    • https://kuxivudu.weebly.com/uploads/1/3/0/8/130813582/fupaz.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/f56bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_6011c87fd8569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5fed7220914eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_601127fc21f1a.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/kideki.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/purawuma/game_indie_adventure_android_terbaik.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/destination_wedding_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/siberian_husky_pet_guide.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_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 5336 bytes
SHA-256: b806f3c10c865c61adf6fc63354cc5bef13943c41f6c8353c61e6de8dcc2f3f7
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 11232 bytes
SHA-256: 8651aca64bcfb52e81b6b8b829de01305470d576a7ebbc797a993d02e0fc96a4

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