Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a2897a539c75dc…

MALICIOUS

PDF

77.9 KB Created: 2021-05-16 11:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc4d8aa93a1ba4933186eaafa0c0c2b3 SHA-1: 9910bd8e2a316328b26e1af8e3ce167e914c07fe SHA-256: 51a2897a539c75dc9041b58e823867a077032ffce43b35ff3a03f2a8117b1f9d
186 Risk Score

Malware Insights

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

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 0.9997

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://ponafet.ru/strik?utm_term=can+you+use+your+own+domain+name+with+wix PDF link annotation
    • http://vomuniwawan.iblogger.org/define_psychology_of_education.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_6044ff616a194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_6035440a668c5.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/13748791208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_5fc6931a0653f.pdfIn PDF document text
    • https://bufasadapigeze.weebly.com/uploads/1/3/4/3/134307931/xadenex-pomowukanopugu.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/xiwaju-nozopiwo-sagemifuto.pdfIn PDF document text
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/b23261839d217e9.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/65c1f9b95.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/1448731.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/deburofuses_worujefu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415531/normal_5fc8ad62ca91d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_60312c6c02d95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_ff3959d46c6a45f39d79ed9224d0165c.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_ed51dcdf79174665a2a670b275955585.pdf?index=trueIn PDF document text
    • http://xuditameka.rf.gd/41343305750.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_490a509024c04ce390a397d0dca6fd67.pdf?index=trueIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_774f48a6222e46ff87f89039fbb15062.pdf?index=trueIn PDF document text
    • http://nadezuj.epizy.com/marvel_comics_1001_read_online.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/angulos_inscritos_na_circunferencia_exercicios.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_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 5200 bytes
SHA-256: 4f8b919b6487c4e941fd27ed4c8bb7c4d5a7ca86e9b03fed855ae83e7247bca1
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 11364 bytes
SHA-256: 35b417993089faaf4a80e024aa75b4619428adbd4a009e7aa127a2708416c546