Malicious PDF — malware analysis report

Static analysis result for SHA-256 21474dfc0dc01e3d…

MALICIOUS

PDF

80.5 KB Created: 2021-03-07 09:04:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c712e988b5a413346016c77ff1a00814 SHA-1: 666cf4b6be4cb260156cd357422fd8eeb67f59d0 SHA-256: 21474dfc0dc01e3dadf09ceaed0b9fa3a17793a3b70ad38d4bccb0c87f9e6184
186 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://pelibifir.ru/award?keyword=asexual+vs+sexual+reproduction+advantages+and+disadvantages PDF link annotation
    • http://niluwipewuxasa.medianewsonline.com/gusosesaxalapivivefufas.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/SGngiNH/kirazutewirodubu.pdfIn PDF document text
    • https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/kutorazotejuzat.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/vupon.pdfIn PDF document text
    • https://wenibowefopari.weebly.com/uploads/1/3/0/8/130814001/1c4623f062d.pdfIn PDF document text
    • https://favobilumosuxo.weebly.com/uploads/1/3/4/7/134733594/zukepa.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/119503c2f5f85.pdfIn PDF document text
    • https://cdn.sqhk.co/gifitebona/ChajhaI/xfinity_stream_app_samsung_tv_black_screen.pdfIn PDF document text
    • https://nopiviwefimak.weebly.com/uploads/1/3/4/7/134708781/b89e95cb652a0.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/nelegokitepigu.pdfIn PDF document text
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/7111842.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/sijapeb.pdfIn PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/pikaxidozofon.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/asus_n66u_wifi_repeater.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://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_ac6667accb604ac4a75ccf1435e475fe.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_8ef1e04f9efc4179ac7fd51168b8a907.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_984b86a7e11c40769f3193493dc98a51.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_27241b4dc165482f982d0e69859e47f1.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_372bebbf862943b5bc789e42cf549556.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_f87c4773761e4a779bfa646c384f7fdd.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_0ac3af861df749819c6ede68e76c98a1.pdf?index=trueIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_bb3548b8726548ad867b47f89de4aaf5.pdf?index=trueIn PDF document text
    • http://kikukuvikato.myartsonline.com/pixibawuxufafa.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_2d070c5f8a9c4fe181c9ebf36ccf21a4.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_512ea6cd12c14c36b7e37a6d10503ad1.pdf?index=trueIn 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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 5240 bytes
SHA-256: df63224257ba01fd794ea613c0fc4afd19377414008aba67c70d1980897e1ec9
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10532 bytes
SHA-256: 510b19578d65b0b010e1ed6c204670965e83c3477866e535ec19ed389499702a
font_02_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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