Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e122a68554a11c…

MALICIOUS

PDF

60.9 KB Created: 2020-12-17 20:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 723beb8c5a8f5992d85ed498e4692524 SHA-1: d70ca43669575c5f4509b0f563e42a20d0189b0f SHA-256: 65e122a68554a11cf91326b7cefd58779bfe0a5556d2f9416caba1e48c161037
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=lockridge+grindal+nauen PDF link annotation
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/puwamajimabisul_vozusaj_guvegula.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/leritep_zababaviwore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5fb30c5118755.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/jiripafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381759/normal_5fcce848c0c30.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/2d90f3b3.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/benofewotadogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_5fda4527d0c95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fc593acd0ec3.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/c679598a-8a33-416a-bd46-6c0bb9b965ec/figure_drawing_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcefd143d778404109110a2/t/5fd6ea5a5488895576bfc95f/1607920220120/apex_legends_error_easyanticheat.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51d3bc89e1c4b8fd9e252/t/5fcd57dcf94b6402b22ac833/1607292893573/14610824062.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d12c3dfdd95b60d4a66f/t/5fc406a8f81c9a2a0c1f4c17/1606682280762/reverend_sykes_park_tarrytown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35094e80-3571-4d28-8142-1cf6fd402e58/78309486166.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9fec917750a3d7b949/t/5fc36ffd173fb5383b0f4742/1606643710036/2_to_the_5th_power.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14892f9866f3fd2d6f995/t/5fc5d00bf8cdb769c6ad1b03/1606799371877/86132141777.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_off0000b390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB390 4932 bytes
SHA-256: ca47afe29dd9e5c72c90bbfe3177db1aa6b4ca6c6de3af7a13b3d8d5ee1a0f7a
font_01_sfnt_off0000c46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46C 10112 bytes
SHA-256: def682699c6d6e8c5a32496c912787b3a1d7efb4a2bae855f2e4abf55a5836de

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