Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d82a1aeb0b6e6a…

MALICIOUS

PDF

81.5 KB Created: 2021-06-11 06:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9a610ed6677a5b4e797788b3b536295 SHA-1: e250dd32a9fbaafd3b26e1ea32451c5ab5bbe94a SHA-256: b1d82a1aeb0b6e6a1d5218cdeb26250758bc48d8c8e3362437f29541224fda68
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of external links, characteristic of a link farm designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, with the primary malicious URL identified as 'https://jottigo.ru/123?utm_term=ataxia+disease+pdf'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create SEO-optimized content for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=ataxia+disease+pdf
    • https://static.s123-cdn-static.com/uploads/4410988/normal_5ffdf800da3dd.pdf
    • https://xuzexutibezime.weebly.com/uploads/1/3/4/9/134904436/1788448.pdf
    • https://cdn-cms.f-static.net/uploads/4383923/normal_604a2b061a8f8.pdf
    • https://cdn-cms.f-static.net/uploads/4475734/normal_606721e22b725.pdf
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/tumivurasulovatatim.pdf
    • https://fufuwotasivixi.weebly.com/uploads/1/3/5/9/135966690/45849932.pdf
    • https://cdn-cms.f-static.net/uploads/4489740/normal_60659c48ad7f4.pdf
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/duletopufo-kawusipipurimog.pdf
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5fee847837f93.pdf
    • https://wolemokopafono.weebly.com/uploads/1/3/4/4/134460240/3859334.pdf
    • https://zumizosapozogem.weebly.com/uploads/1/3/2/6/132681504/tesumatudetatelenom.pdf
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/3aff5233459.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f9958dec-6270-450b-bb18-362556cb7c2a/30183333922.pdf
    • https://uploads.strikinglycdn.com/files/7ac56448-1409-490d-b0b2-e11aef7339fd/fotenebum.pdf
    • http://zuwofig.pbworks.com/w/file/fetch/144643449/90215945233.pdf
    • https://uploads.strikinglycdn.com/files/005e1018-689a-46c3-9170-b5d3d5c77e78/95258607928.pdf
    • http://nijosifa.pbworks.com/f/area_calculator_for_land_apk.pdf
    • https://uploads.strikinglycdn.com/files/e624b4f7-f5a3-458d-86a3-4b1f60b973cb/my_talking_angela_2_game_video.pdf
    • https://uploads.strikinglycdn.com/files/82fe5928-6b71-4a0c-be72-d154fd781684/instrucciones_para_hacer_manualidades_con_material_reciclable.pdf
    • http://pevozowo.pbworks.com/w/file/fetch/144423942/57868551621.pdf
    • http://wixugigir.pbworks.com/f/engineering_drawing_multiple_choice_questions_and_answers.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_off000103c9.bin
79a6d8e0d1f2b734f8e3b2b316bebc8a34650df6fd5cd6a7ae06229591fb2a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 4964 bytes
font_01_sfnt_off000114d0.bin
2832510a5066980743efccb54f1b3c71d4734187b11cb76b43f173ea3dc498b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 10520 bytes

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