Malicious PDF — malware analysis report

Static analysis result for SHA-256 655795696e9b0660…

MALICIOUS

PDF

66.1 KB Created: 2020-11-21 04:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7d20202b0ee58225473d0bd2dd8cc1ab SHA-1: 1b23cdaec22e6b2e2c8e5d65694a206e219c56b6 SHA-256: 655795696e9b0660b85b084d8c0cd16481db75e49167e4be42e187c4437db3d7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to link farms and redirector infrastructure, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links suggests the document's primary function is to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=digidesign+192+manual In PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/d2ed8d8fa88d8.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/f5d445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5fa36bbb080f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8d4e241e61a.pdfIn PDF document text
    • https://wuxepufoz.weebly.com/uploads/1/3/4/3/134371519/jaxuwogomexoganumuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_5f95d26d837ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f8982474197d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_5f9e7a5224b78.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/zuponefi/congoleum_prelude_sheet_vinyl_flooring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690d998a-018d-4b30-91e7-f8bb30d54247/wexizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbda11b-66f9-4a0c-83e0-fc4f4494e334/the_lobster_script.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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 5388 bytes
SHA-256: 4a2b5d319f832fdf88e8e925a30e32d74e303a28594454fa96132bb18a5e2adf
font_01_sfnt_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 11260 bytes
SHA-256: 8bb3dc7cf9f2e8c477aa77967dbca60245ff0f67df91eb942aabb4848109c160

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