Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f9451e3777c478…

MALICIOUS

PDF

72.7 KB Created: 2021-04-05 09:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a390a3e76401de38d1e87805d06b7b33 SHA-1: e6edd2311b4a80b2f757c73edcf896dfbd204959 SHA-256: b6f9451e3777c47833db00a63a0f3eb8e0f6b75754bacd8c738ae5596b422cb3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to exploit users through deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=venice+italy+guided+tours PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5ff5859c5c60a.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/chicco_keyfit_30_width.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/31535081523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5fd3cb6c72f52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_5fe2058d661a4.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://s3.amazonaws.com/xefezesebusu/cisco_networking_academy_curriculum_4._0.pdfIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_e369c488f38445e497ac4e7a351323c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/tumse_achcha_kaun_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/50026061182.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_c679700c244e4f849fd9aebb15c42685.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niporofez/how_to_draw_anime_woman_face.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/niragapogirewefa.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/bazobila.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/fogagedu.pdfIn PDF document text
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_3b164bc6b4444131b08bc0cba485c74b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1271de1-73d3-449b-ae71-ec726fd8f27e/porebatege.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/36301523051.pdfIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_bb54167bf93147a38da272596b9849d0.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_6345c5680782430bb6adfcb6ba36b4bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2f42f4-78b3-4809-b7ee-238272404a19/poulan_pro_20_inch_50cc_chainsaw_pp5020av.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_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 5056 bytes
SHA-256: 640eb29281d735b84a0eb96ce132d6e4e7bfc5e8e1b08d2dc586d12cabbb7b2e
font_01_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 10776 bytes
SHA-256: 35a574f41d18b5e09b4f9313b8894ca6ecb6b350bd6b999713f8f83c56cacd0b
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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