Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a436c61bc22b0ae…

MALICIOUS

PDF

76.2 KB Created: 2020-11-22 05:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4d3bf73e98b80e3826e8ee49270ecc4c SHA-1: bf0f3d713208e13e526f65d71c336d8fbb34c450 SHA-256: 6a436c61bc22b0ae465137b54098b71bf2e1c2db57f94276fad0dcce80868187
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gettraff.ru/123?utm_term=copenhagen+to+hamburg+ferry In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f8b6e732ec49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_5fac54b8dbdc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_5fa533c2715d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5f9bac680535c.pdfIn PDF document text
    • https://kegixofuwo.weebly.com/uploads/1/3/4/5/134577478/badimurer_besavesi.pdfIn PDF document text
    • https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/9595299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fa70c53254bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f928e0b27740.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/0c994e5d-fcd7-461e-978d-ffa0362ef856/jefadisubajuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527270a2-6cc4-4291-ae85-72f4a97837f0/jcpenney_stores_closing_list_2020.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 5252 bytes
SHA-256: 2645ed5d94a950f383f13d064cd28e47eac22a3f0be48775b93f4cdc5d4b3a23
font_01_sfnt_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 2512 bytes
SHA-256: 33da52bd36b5122ab6163aa4562414495d2418749f3ade149cf4d008a4f4e9b6
font_02_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 11972 bytes
SHA-256: e822d04b5ef146d1789f9a9556432ee1ca27a50f644569e1f86daf7992a22e16
font_03_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 16184 bytes
SHA-256: 8d7dce64089b0b800ba75e10fd642fc1fa12f6b2cef646d48aff6d02ec0dba67

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