Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a0bc89114210ec…

MALICIOUS

PDF

106.1 KB Created: 2021-05-07 18:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 890df93dfcf43b2dcbff6f05856a742e SHA-1: 99c529e940bb7ddd2c4bd6e6108f9e431ba30c66 SHA-256: f0a0bc89114210ec2a72ebd7a1dfd1375c83fefa1ee9f6aa50969ac0562d042c
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious redirectors or part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution disguised as educational content. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=basic+mathematics+form+one+notes+pdf In PDF document text
    • http://sunepoxuvigos.66ghz.com/54319668661.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/OTgdhar/ximojuwenamularobapupop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366949/normal_5fde87460cc6b.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/c1jaop3/captions_for_pics_with_friends_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/igighie/dufalazozigejerojav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374371/normal_5ff149243fa75.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/Jhegdie/50982161703.pdfIn PDF document text
    • http://xalenupom.getenjoyment.net/central_vs_peripheral_vertigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timojodabemisux.myartsonline.com/animals_and_their_baby_names.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/bfa_blacksmithing_guide_8._2.pdfIn PDF document text
    • http://sawopirorafo.rf.gd/is_fe2_or_fe3_larger.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/94317592261.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/nonalufigisakipu.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_d42d398910474b6f833472f6a8fc491d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomepixo/california_dmv_forms.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_3f6f64a70bac43249539709ae59b07a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/mobaxokijereloj.pdfIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_4f15a8c0eea841d0a6eec35f2a74c5a5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D12 5412 bytes
SHA-256: d47d76fa291850e6348a86da9bea0a57bae2c70010338a48489302529c0851dd
font_01_sfnt_off00016f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F4E 13264 bytes
SHA-256: dec1b4e19764db134b7e45546508605a7a92031360530fd73db7eb775d272d07

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