Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbd24ddb5009087…

MALICIOUS

PDF

74.2 KB Created: 2021-05-21 08:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7332408a1bafd88975a8caa3d1fb7715 SHA-1: 2642c4bf5f8b0ff09ac224ef6bf98b447267d873 SHA-256: 0fbd24ddb5009087a85e31f192fc6d6bc3a10d9840b86fbd5a02fbd96c3ccd9f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=tamil+old+songs+mp3+collection+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444353/normal_6009c3b74eaf4.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/3724130.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5ffe81bcdcdf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_604ce710dc06c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_6024b23ee582a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_6064fb3d8ea28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5feaf5981faee.pdfIn PDF document text
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/66f3531b56a5aa3.pdfIn PDF document text
    • https://vatilevemuwaji.weebly.com/uploads/1/3/1/4/131453872/zerapebitas-dojaxejilatep-famuputexotate.pdfIn PDF document text
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/2853949.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471971/normal_5ff0a5ee3b293.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/xukasijuruneg_pebalinu_nukoruku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_6016c67b257b1.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/08e283e7-df28-49dc-bce7-fd156b14a73b/bolt_action_a5_rulebook.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/38678199081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f254498-7315-4138-82aa-e13397d16313/ladibomuwup.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/can_you_wirelessly_charge_magic_mouse_2.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/abertis_annual_report_2007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9345f4-1137-4b31-8454-f7e6aec29695/51408530944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0223105f-72de-40b4-bb11-c0b1fd3b81cd/zekudoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fc3ac2-d594-4b31-b72d-fdcab4b03f3b/25850378461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59199701-4d3d-43bc-bb97-90e1fe430786/80547882071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1405156-f62b-4c57-abec-0b0563d6cdc3/diccionario_ingles_espaol_oxford_pocket_precio.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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 5504 bytes
SHA-256: 0a3b8fc7a74593747386beb106fc683a742703bc78415e5747f4e582cef2298a
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 10960 bytes
SHA-256: 45ad5e90e2b74824846d94a7fffad0d3fcfab54ec4092e55118c46480d8958e6