Malicious PDF — malware analysis report

Static analysis result for SHA-256 707589d548626d2a…

MALICIOUS

PDF

70.1 KB Created: 2021-02-15 01:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: dbca9a1e3794bcad4807240e3ac2ce4d SHA-1: 3ed7cbbcf0c9787f1ac92b86b1622de6dd45a5ad SHA-256: 707589d548626d2a93ed244bca1d2e21df4c4170ba1729bc5f794f7979082ed0
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to a fake manual download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable hosting suggests a link farm designed to obscure the true malicious destination.

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://druttle.ru/123?utm_term=brother+intellifax+4100e+manual PDF link annotation
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/b836bb79376b6e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384461/normal_5fcbe99aa69d7.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/5558103.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466143/normal_5fce664ea898d.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/LFgjhaM/95647512920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_5fdbb46b66799.pdfIn PDF document text
    • http://kovefubiwajulo.22web.org/children_s_day_quotes_images.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_6013b6cbca50e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465397/normal_5fe50b62423a3.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/6c5174732794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60210be422fe5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480880/normal_60067773c1869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_5fd2d251c2884.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
    • http://jixonolalosixew.rf.gd/kexebubuferijojagunudi.pdfIn PDF document text
    • http://fodakobenolam.rf.gd/assamese_film_site.pdfIn PDF document text
    • http://lemijafuw.epizy.com/1812457505.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_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 5108 bytes
SHA-256: 41c384d51aaa9590aff977a63f96529a0ddebdf359a830ad39b4c26c1eea582d
font_01_sfnt_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 10784 bytes
SHA-256: 0d65f11ab910c058f23c2beb1b72d68e8af3a7750cceaa1d3a975c4924f14cbd
font_02_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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