Malicious PDF — malware analysis report

Static analysis result for SHA-256 8786c469fb7eef42…

MALICIOUS

PDF

76.5 KB Created: 2021-05-16 11:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2be73d229b2c10422b9b964a24db87a6 SHA-1: 53b36c4d0241fa47eb5a2f32c6df5b8d812794c9 SHA-256: 8786c469fb7eef42d0c302849f1607bcdd77fa191bdeb1b9995c43499864d672
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=hp+pavilion+27+all-in-one+desktop+computer+core+i7+review PDF link annotation
    • http://sejerodetupumil.medianewsonline.com/arbain_nawawi.pdfIn PDF document text
    • http://marketes.pro/interior_designer_salary_in_texasu6r27.pdfIn PDF document text
    • http://madewithsunshine.com/tc_electronic_mic_mechanic_reviewguhga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493200/normal_6005f60184e8c.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/monosacaridos_disacaridos_polisacaridos.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/GiYbngd/30403357763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_605c320d6ec66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_60218a3d34f21.pdfIn PDF document text
    • http://findssldz.xyz/jabigurizirulupivafebirai5bdr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_605fba38483fb.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/jdxjfCe/bizakurowe.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/c952ca5a-032e-41bc-943e-f9a8cf99078d/37903480369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90d1af4-5528-40cc-852e-5b2db794aebf/6560392816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd531a8f-a75d-4f5c-b3e9-7824bde434ed/14155377566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c807d02d-c09f-4a7f-9f6b-4966d53a5ce5/zegazinezakimoj.pdfIn PDF document text
    • http://roruvavaderej.epizy.com/telecharger_bible_aelf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc2f210-a23a-45ab-beba-d03c5de902b0/international_lawyer_jobs_nyc.pdfIn PDF document text
    • http://zexukojol.rf.gd/tezemutagedomovesasepop.pdfIn PDF document text
    • http://fuzadakeju.epizy.com/39433251680.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 5640 bytes
SHA-256: fe27a1eb3a591c6492775d7fb5e6aa88f3895945728efa8e1a329d6976981803
font_01_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 10628 bytes
SHA-256: 32d2045916b1d1b0bf5c286b45c4f0a5699e4408991979422726fa6973bbc990

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