Malicious PDF — malware analysis report

Static analysis result for SHA-256 636ced72561f6b7e…

MALICIOUS

PDF

76.1 KB Created: 2021-04-01 19:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 300f671229032700b931db3ad58c61e6 SHA-1: 53e77e30116d8e94950e064fec519039bdfb0198 SHA-256: 636ced72561f6b7e070d9d4a46051693d4b92f9c2383c3b2456d543b6de99c1d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://leonvi.ru/award?keyword=dependent+clause+types+pdf', suggesting a phishing or SEO spamming attempt. ClamAV also detected this as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://leonvi.ru/award?keyword=dependent+clause+types+pdf
    • https://cdn-cms.f-static.net/uploads/4477155/normal_601da2e4d48eb.pdf
    • https://cdn-cms.f-static.net/uploads/4427282/normal_6041ef2cec87c.pdf
    • https://cdn-cms.f-static.net/uploads/4402289/normal_605d7e86e04b0.pdf
    • https://cdn-cms.f-static.net/uploads/4488135/normal_6063081f87a90.pdf
    • http://makeyourself.xyz/24785758884mz18f.pdf
    • http://gsmall.space/fluid_mechanics_8th_edition3pjyk.pdf
    • https://cdn-cms.f-static.net/uploads/4415756/normal_60648f4b3e5a1.pdf
    • http://registrat.space/cynosure_apogee_elite_manualtkmvf.pdf
    • http://jojidasusesot.sportsontheweb.net/24120477752.pdf
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5fee638d6f1ee.pdf
    • https://cdn-cms.f-static.net/uploads/4495387/normal_5fe6c447d4d75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gizonukorad/whatsapp_business_apk_old_version.pdf
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_a3f60009df0d4d4695de6e5487218b2c.pdf?index=true
    • http://vajapojaperusu.myartsonline.com/chartered_accountant_interview_questions_and_answers.pdf
    • http://varirojemixu.myartsonline.com/cuales_son_las_bases_nitrogenadas.pdf
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_c305f30e5be9416b97f17f4119c9a0fb.pdf?index=true
    • https://s3.amazonaws.com/wewuxuviwar/guxenofuzi.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_off0000ede9.bin
6c02ef8cd08a4ca3d2f265ba23fcfc21bf2faa06a3de464805ea0ff3a1fe15a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 5156 bytes
font_01_sfnt_off0000ff9a.bin
41be9d73ba5f5d7bf400bf3365af4bee439d7adcf438f80262c90de5e4175be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 10420 bytes

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