Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf4634375ef9b8c…

MALICIOUS

PDF

67.5 KB Created: 2020-11-24 03:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c49ad71a32752bd8219f3b90a3015243 SHA-1: 4fc0489b352e70c70a59b81fce9824ba695f5a68 SHA-256: 7cf4634375ef9b8c0fb01a18728414f2c0a715b7e3c24b108e0d47e09325ef23
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to potentially malicious external sites.

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://traffnew.ru/strik?utm_term=wii+sports+resort+wbfs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8c9f2ea20ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5f9b2e4d3358f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_5fb3dc3918193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_5fb37335689af.pdfIn PDF document text
    • https://kapelomapo.weebly.com/uploads/1/3/4/7/134737659/fofufe-jinalodubutifin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_5fa5bf45bc33b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f94e71d354d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_5fa9e4831d71d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f871e595312a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394068/normal_5f9cc25d36db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5fb4d6736f07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_5f976a21261a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_5fad99f9c4811.pdfIn PDF document text
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/271a86b4ee4f869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 6348 bytes
SHA-256: 70d2764314fbef5ea3fcd49db9daf23744983a8a1a917e4be4b52ca4c1ad883f
font_01_sfnt_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 4900 bytes
SHA-256: 95adde02a0c2ef38acf8ffbabd2f7ecf4a01634f3d94fbea992e7b93c6ef58a2
font_02_sfnt_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 10976 bytes
SHA-256: a05a2c173995cccf8c571c0a86f0748ba97b70c233718c06aa197e6ecf3d1707

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