Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ccf23b3b167f41…

MALICIOUS

PDF

75.0 KB Created: 2021-04-15 22:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d52dcc44da717d09e86cb993b5ae35db SHA-1: 81a9e1099f83534b96a86b9d7699f60398a6d211 SHA-256: 84ccf23b3b167f41e60f90757da7f6109b58139a63c121eba739458a055c539c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to obscure malicious destinations. The primary malicious URL identified is 'https://baarspo.ru/strik?utm_term=holy+quran+in+english+for+sale', which is likely used to redirect users to a phishing or malware distribution site. ClamAV and ML classifiers strongly indicate malicious content, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=holy+quran+in+english+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450243/normal_603b5d82dcdaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_60316905a0df8.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/db7c98013b.pdfIn PDF document text
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/vitowifalifobixexo.pdfIn PDF document text
    • https://cdn.sqhk.co/varipivokil/gfz9ojj/adobe_illustrator_free_2014.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/hd4CRjb/robodeniwa.pdfIn PDF document text
    • https://cdn.sqhk.co/mamozinuba/RjhgboS/rowijigisufuvunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_50cd4a655e2c480a8bb844d26df37616.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_5e566c75c5f643c0865cb4b40819b509.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevelel/weekly_planner_template_with_hours.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_642d9001fcb84ac5940558a50a428fe8.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_93161975a5694f86ac9f9420d766196b.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_6981c6f899c846e5af473a53276e8380.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_b8aac262e2d44b39a543bf3ceb12bb4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/73719457329.pdfIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_2f25c60184c8411c9888bc56b2aeb8ff.pdf?index=trueIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_80bdd6a832fd4b1fbb3130a2593671dc.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_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 5216 bytes
SHA-256: 56e73cd0e06249fb3f9d61486e09ba69f968784ef56d0291b0ab67ff21d8fbdf
font_01_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 10752 bytes
SHA-256: 58ec0f4daaf72df66696e9aab63186e5fcb24caf5e1e924c29c2f84b9c0d6345

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