Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5b99563a450cae…

MALICIOUS

PDF

78.0 KB Created: 2021-05-11 02:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a24cc18b5c2bf10abdca2caae45aba4 SHA-1: d8aea856ad64afe75583415bd67e5f8e6cbce6ec SHA-256: fd5b99563a450caef524097041b52a64a4a502d466f5eb2017b61f5845e49d28
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, and 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a precursor to delivering a password-protected malicious archive. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/strik?utm_term=sustainable+development+goals+pdf+2018
    • http://hookup750.website/watch_cnn_live_online_freefaezi.pdf
    • http://net-klientov.ru/how_to_read_candlestick_patterns5jdac.pdf
    • http://kexisugotiro.22web.org/34571765990.pdf
    • https://metolokinazez.weebly.com/uploads/1/3/1/4/131452743/puwir_vuvor_zipunitofezovo.pdf
    • https://furadigiwib.weebly.com/uploads/1/3/1/4/131407367/fexowefofigoruwez.pdf
    • https://gupobotinifetex.weebly.com/uploads/1/3/4/3/134338345/8465228.pdf
    • http://detonic-official.website/mawixujezy1dkd.pdf
    • https://cdn-cms.f-static.net/uploads/4489969/normal_603442b5a0dc4.pdf
    • http://copyrightsafetyhelps.com/3261601470354aju.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5fff6d35b36e6.pdf
    • http://idealica-official.website/69930359840wonrz.pdf
    • http://wivejudotimog.22web.org/26024846592.pdf
    • http://fakixuvodiwiros.22web.org/assurance_automobile_maroc.pdf
    • http://my-favshopd.online/damazowafefokixirupowaz21by.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_aa9e7ef8ea3a4d86a4fd703a7f577ce4.pdf?index=true
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_bdddac937aa94b669e16228fefa32f05.pdf?index=true
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_4af43353b7d6408da0dc6594d4edae3f.pdf?index=true
    • http://lodonevubepivor.epizy.com/rejagezitizasolonavi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f136.bin
54149f0ada8c20d1405977b7781795489906a1be12e90527f8be90c2e10a986f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 6088 bytes
font_01_sfnt_off000105e8.bin
fbfcedc4036190ce1332aa684207b4772c1cbd1a08cd3c979f316df71c049d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 10856 bytes

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