Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d2670c56759d9…

MALICIOUS

PDF

147.1 KB Created: 2021-06-06 08:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81d1385752f6b418c39985fe263c96c0 SHA-1: 05a4b79818e0608154c1e4521377d028509b9eb8 SHA-256: 924d2670c56759d986314b5e070e8f905fd4a4731b721b5637e57c6abd313e60
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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 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://ponafet.ru/123?utm_term=arsenal+player+pictures PDF link annotation
    • https://laxoweveludek.weebly.com/uploads/1/3/0/9/130970009/4920076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_606a9290e5a55.pdfIn PDF document text
    • https://tebelusagunesaz.weebly.com/uploads/1/3/4/3/134318259/konulakokutowifopawe.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404969/normal_60b6728a8c1ab.pdfIn PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/mobakodejatoverepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5ffbcbd39ba30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_60217871d3fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_601fd9d52918d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fed5a32dd0d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_60438eeacbc47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_602902b3e1623.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/c978b140-52e0-42ff-891d-38f896e89bce/canada_food_safety_temperature.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144615318/gamup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006b310c-3fed-4d60-a12c-95e523f5248c/how_to_set_a_citizen_chronograph_wr100.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/deed_of_absolute_sale_vehicle_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e1d04b-6d1c-49e2-88c8-90548bccb5a0/94440283982.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144458406/pupok.pdfIn PDF document text
    • http://pimepovume.pbworks.com/w/file/fetch/144480192/logitech_k360_volume_buttons_not_working.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144535185/sao_alicization_characters_wiki.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F028 5016 bytes
SHA-256: dfa056d1e86b88c19b29963776e08e9f54c48f5a6eacd3db3c60de96cc6aeb58
font_01_sfnt_off0002014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2014E 11968 bytes
SHA-256: 817e22478cbbb0fa6c46157c655cc8568ff6dffded0a1101de37b9115c78fd99
font_02_sfnt_off00022966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22966 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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