Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c64f6d0c59ec336…

MALICIOUS

PDF

63.1 KB Created: 2020-12-22 02:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 05a604311f59a6fed10422e195fd4b72 SHA-1: be57b84deb3ddd4cd9dde4d0257ef6cb11027112 SHA-256: 6c64f6d0c59ec336600e5a14bbc10f38e5ac7ee534624ecadce700a66a0f06b4
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

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://trafffi.ru/strik?utm_term=stumble+synonyms+in+english PDF link annotation
    • https://vezexozozufizus.weebly.com/uploads/1/3/4/3/134372857/kizarele-sidosora-vebuvowemapewa.pdfIn PDF document text
    • https://delujopasetew.weebly.com/uploads/1/3/4/3/134399242/ffacc7259d5d.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/32b2700cb7.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/dorirevelenopa_dituvezojotat_fesipelet_bipalexa.pdfIn PDF document text
    • https://xawupaxov.weebly.com/uploads/1/3/4/6/134699297/2d02d2.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/c41fad0c-2845-4a3e-a5ee-8a2aeedc9864/rolididapixavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d357852-09c0-45ad-b8d3-f9bc5f64dd12/caractersticas_de_la_investigacin_cualitativa_en_educacin_y_pedagoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1f590a-ab81-4aee-b39c-0d8033227195/51537946939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc855d0d-85d3-4044-afb0-4090e0da8429/best_break_resistant_dinnerware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988a12f1-b7fa-4e64-a749-a6ade3967699/artful_dodge_pathfinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1487dc-81ab-402f-af8d-efada0aee527/nimovakavawidiwulowugal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b800bda-f428-435d-9119-f01c32e16892/word_with_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c8271b-3c2e-41bc-a182-3733c89fbf82/bomuzelutidukez.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_off0000bbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFA 5136 bytes
SHA-256: af10b9371e2d1899985de99d609805623a37db413f1147d94c3f4b44fa694c4d
font_01_sfnt_off0000cd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 10112 bytes
SHA-256: a60e79c05727c379cf0821f094c4a2e04b4b060bbecaa3d7bb579d00a1369c4a

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