Malicious PDF — malware analysis report

Static analysis result for SHA-256 21925351c2d591cc…

MALICIOUS

PDF

68.4 KB Created: 2020-11-13 14:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6c20320af07d54788b1f4fdef06c33bd SHA-1: 718b6e3b4634158ce3f97e7a56efb15b08c58850 SHA-256: 21925351c2d591cc5c2f385ed4ff7a62b1c51105f9a8c2ff1165c17968e8308e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or content-farming scheme. The primary URL, 'https://trafficel.ru/123?utm_term=what+light+jay+asher+pdf', is likely a lure to a malicious site. While no scripts were explicitly extracted, the PDF structure and link farm indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=what+light+jay+asher+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5fa8380928c5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_5f9d944766d09.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/xanemufawigumasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f87647b1ebdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f972367250fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f9a5bb27e106.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/a552a97af9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f9089663f6ad.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/7ae7dafe-1686-4ca6-8bca-8f8172e4b539/zopanixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60228826-5d69-4462-8a97-6c392f91fe88/yamang_tao_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ccb0fdc-4862-4c22-bcf3-d479e6ec4396/sapibivafazogubur.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_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 5492 bytes
SHA-256: 105d46f770c4051e98f282bb2bb67c47c09798b3b2a21c0e84d6902c9f46fd90
font_01_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 10112 bytes
SHA-256: 03d43117bc2600b63c7ce4b3abebd1a80b8728581f79591a861a1d42d45c0310

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