Malicious PDF — malware analysis report

Static analysis result for SHA-256 73aa7ed937164699…

MALICIOUS

PDF

67.1 KB Created: 2020-11-18 07:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0240eddaa7cf6c3547c1dbfc2b180a42 SHA-1: 7e928961a38e58194f7386ba057b80b59589048b SHA-256: 73aa7ed937164699c9ea3a1bc8d62727f717a2775b2eb54b52ab5590e1930677
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with one heuristic specifically identifying a large PDF link farm. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to redirect users to harmful content or facilitate further infection. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafftec.ru/strik?utm_term=android+club+subway+surf+hile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5f999dc4af035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8846ed7eab7.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/472663.pdfIn PDF document text
    • https://fujamimoxelak.weebly.com/uploads/1/3/4/6/134601663/47bf7c31cccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5fab66b619f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5fa023f15febe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f8e6fffa1427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd62aec-1fdf-47c1-a34c-dbe40e91deec/dururilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3585f76c-2ced-48f3-bd5d-538a9858866f/buvukiguvisetaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8bf8df-5b28-422f-bbdd-5dacdde799aa/xevuzugepazukapomaxutiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15fb3c7-e51a-4c38-afd2-207706c1ad38/summary_worksheet_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/believe_in_yourself_joseph_murphy_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2c3b17-c9b3-400e-afc0-04857aa2cb94/weight_painting_blender.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_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 5432 bytes
SHA-256: 31080e62324cd08be3dd658b7161f9fff6ba4433749028d8be6a86032660825d
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10312 bytes
SHA-256: cad82c1a71ac16e314495e916a7b658568f821f0798097ddb25e30fec8524c46

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