Malicious PDF — malware analysis report

Static analysis result for SHA-256 420ec08d23854186…

MALICIOUS

PDF

80.8 KB Created: 2020-11-09 23:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c06a6136d78915799dcb072e670d1a2b SHA-1: d20a0e8b1c5dfeeaa7ae01a5a7715e2e08e55243 SHA-256: 420ec08d238541863e177ba69d990fbb3b648fcd1a3a3b9256d1ae3aad168f03
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious websites. The primary malicious URL identified is 'https://trafffi.ru/strik?keyword=ucf+zip+code+fl', which appears to be a lure to attract users searching for specific information. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?keyword=ucf+zip+code+fl PDF link annotation
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/lejemaminudorava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5fa8a809ecfc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5f9d5067945e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f986093d7644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f890456add1d.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/fuxufix-tesafe-dafujanemapixog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5f9bdeb07c3d5.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/e4dacfcd-c887-4deb-b0e5-bb8c397dbb71/79091302894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7611ef81-04a0-4411-9642-8d6a4cd43a43/bat_box_san_pedro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ddb2a2-d618-4d10-87d2-cd6449754ede/the_birds_and_the_bees_full_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbc217a-72ef-47f3-984b-02a3fc2819f9/mijikokamemuvogare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8e98cc-0236-4951-9c43-e7ba73368a85/juvatotuvowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4a9fc8-5b96-402b-87ca-7a8f7c3305d2/95130716344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f24069e-6564-4845-9237-5db92244ad45/rovabi.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_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 4708 bytes
SHA-256: 9e12b73d1620dc30c1bb73373df1c014a44497bf998727278940e1e543d978f5
font_01_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 10536 bytes
SHA-256: 3119b11b507fd9a622e05d014824c0e40b02a4a9714a548cc90a1d65dcff8b2f

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