Malicious PDF — malware analysis report

Static analysis result for SHA-256 51740105ae1399f1…

MALICIOUS

PDF

76.4 KB Created: 2021-03-07 12:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f04df6824f9d7c7e07ce233577cde0b SHA-1: e5301b3a55d355500d3d2b098dc143136e9041ef SHA-256: 51740105ae1399f1fa2b4d470dd2702dda48561e4d3847cf078ece3829d4fce6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests the document is designed to redirect users to potentially harmful sites, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=spanish+2+study+guide
    • https://pejagefetem.weebly.com/uploads/1/3/0/8/130815482/cd963945dece.pdf
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/437d1754a64.pdf
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/pikil.pdf
    • http://vipadobotisituz.mygamesonline.org/madun.pdf
    • http://rosutob.getenjoyment.net/dovajusavejupakojifi.pdf
    • https://kokarino.weebly.com/uploads/1/3/5/2/135299240/14e58f78edf71.pdf
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/3c1c1960f7d5c.pdf
    • https://cdn-cms.f-static.net/uploads/4373502/normal_6021721a22c3d.pdf
    • https://gamiwejejorar.weebly.com/uploads/1/3/4/4/134498461/xezuxazivemod-zuvafakewobiva-puvorimidaro-gubavisepeku.pdf
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5fee2dcd4dae8.pdf
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/302314.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_7fadd8288dc142428ba8f1de8cac634a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fbf468e9-fb07-4194-a715-9d0396e7d369/takikaworarasikezul.pdf
    • http://zepizevut.atwebpages.com/soil_mechanics_and_foundation_engineering_made_easy.pdf
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_fde39ccc5e6642c9b93dd3de1d8c79a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87d03bdc-8099-4a38-84c4-aaaba2af5e6b/replacement_parts_for_master_forge_grill.pdf
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_2e1b602c325c4ef499b04e3fe3778681.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef58.bin
4483961c725a350a5b4ae5d9732301416eefe1447f4982db39ba14d06e71981e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 5432 bytes
font_01_sfnt_off000101db.bin
b1ff92c9915847c1c8dad0af05d2bff96432f8264f9df539b4a28a4cb895d9bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 10248 bytes

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