Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b076b0f565f7754…

MALICIOUS

PDF

73.0 KB Created: 2020-12-29 11:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6b4512a16cffcb1fd6850de328bd7925 SHA-1: 3ceb25592f7fdf38bb791fba4a97324816c06172 SHA-256: 4b076b0f565f77548135d8e81de86d12cc69f928a5296dd8f266b728bada6212
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=legendary+game+of+heroes+forum PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fcc8c30259f7.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/jiagdI1/nike_sky_force_3_4_grey_fog.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/aaee1dba7f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409236/normal_5fd9f20dad5fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5fa608e3a6072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4bce3d0c-81c8-489f-99b3-b940b56e9c0e/76361074035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26eec0ec-7b85-4c4d-a7aa-d3e7e660c5e9/ripesutolibodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/970d1b64-6026-4322-9d45-0a9dbb0ff668/93828804491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560aeef6-60ca-476a-b770-60644dfeb41e/61729227894.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/cursed_thornclaws_wow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 5088 bytes
SHA-256: f5a7af95384f07f5cc4f14e176b83f7962c9fc8590e4d1cdf14f08181f79f84a
font_01_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 10916 bytes
SHA-256: 19e67152228242b17ba7b9f039dc7d1418079245d72d457cd873ba3d2d1c7e5b
font_02_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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