Malicious PDF — malware analysis report

Static analysis result for SHA-256 af21f1206f2dc188…

MALICIOUS

PDF

105.1 KB Created: 2021-05-29 22:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2ebc03cbb47ab5f8710f35647996d49b SHA-1: aa142ffcaecabdcca17669f1b3ab270cc7fb4bb8 SHA-256: af21f1206f2dc188f8aeef6ab4be285f19751876680c7e17d7000fef46995371
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic confirming the link farm behavior. The presence of external URIs and the overall structure suggest it's designed to redirect users to potentially malicious content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=thermal+energy+storage+systems+and+applications PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481163/normal_6043289a8bf60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_601f5b1f0ea5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_606b96988ab10.pdfIn PDF document text
    • https://satupagewamikim.weebly.com/uploads/1/3/4/5/134584558/mubalewibivevowupu.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/7243193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5fe4acc961e2f.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/sidefetuwuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393900/normal_5ff2e076e9b9f.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/5733076.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/58419af8.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/vejufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_5ff7638fc7b25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fe0859564fe1.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/709f15c6-f275-4e4e-9335-36018f36d09b/86101649447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a45ab2-c943-418b-9cde-513830608931/im_genes_de_rostros_para_dibujar_faciles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0979a6f5-c18c-4fee-a356-cdea0184255d/nagel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14586 5536 bytes
SHA-256: 3ba52418cb78dab9811597908e638708b917a6b6d30e5f64f62b927784d4aec3
font_01_sfnt_off00015838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15838 12460 bytes
SHA-256: 00eccb6b2ae233504d2f791aa83436f8971de4558c6ba0682b7c5d1eb454864d
font_02_sfnt_off000181e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E7 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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