Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbb204d7da5c0e1…

MALICIOUS

PDF

83.1 KB Created: 2021-04-08 01:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe3b43fd6e54d960a7091692c23f951a SHA-1: de003f43e512033a1b05f05c13f5186b5b3193b1 SHA-256: dbbb204d7da5c0e18ed1bc8e147544b503c1d81ccb33ff7a2d06d6520e407c71
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one pointing to 'https://jacksth.ru/wix?keyword=madagascar+toys+smyths', suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document's primary purpose is to redirect users to potentially harmful external content.

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://jacksth.ru/wix?keyword=madagascar+toys+smyths
    • https://cdn-cms.f-static.net/uploads/4454045/normal_5fd2f94c6186b.pdf
    • https://cdn-cms.f-static.net/uploads/4530578/normal_6039cde59db6d.pdf
    • http://sukalolijijegiz.iblogger.org/saxovetip.pdf
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5fea0b7e30825.pdf
    • https://cdn-cms.f-static.net/uploads/4487918/normal_606a1a43f0415.pdf
    • https://cdn-cms.f-static.net/uploads/4480582/normal_5fd9df364f574.pdf
    • http://lajenasuwo.iblogger.org/vemulidegifupobowotepe.pdf
    • https://static.s123-cdn-static.com/uploads/4454984/normal_6000cf7d96c56.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4f69965b-8816-453c-bc78-b68f03a7a2f6/un_curso_de_milagros_leccion_130.pdf
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_0e44006563e34410a1234ad4cebb01ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0c28352-5d19-4ab4-9acc-4277d1508012/formato_de_tesis_grado_unam.pdf
    • http://gikiwajufekozi.rf.gd/67590538085.pdf
    • https://uploads.strikinglycdn.com/files/2dc6f568-f9f0-478a-b9e3-0f4cba4a0cda/how_to_think_positive_thoughts_in_a_relationship.pdf
    • https://uploads.strikinglycdn.com/files/21f8cefd-0d6c-42fd-a7dd-02e713464e8e/30586919381.pdf
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_e0a513f5dc6f4febb025c093bd555892.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1aa28205-af3d-43df-9e91-7cbc7c0cc055/why_is_my_verizon_cloud_not_working.pdf
    • https://uploads.strikinglycdn.com/files/95a694ef-6670-41ec-8117-b45307df3edd/tupirogebevoxobe.pdf
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_55a667bc9af84e4ea8ecf304aa1dbce4.pdf?index=true
    • http://naremijex.epizy.com/lewizivifekozaliniladi.pdf
    • 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_off0001077e.bin
cfbbf3819e8c20fd3f8e7f4703d06b21c78309c27ab2aeb93da2da10105dc45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 5428 bytes
font_01_sfnt_off000119dd.bin
777d3150843407b679f21edf25e7d9599ebdf3c41b582ea590e553047e2ff659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 10928 bytes

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