Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ec8c45522cb3e1…

MALICIOUS

PDF

76.4 KB Created: 2021-05-17 10:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5f95a5d6a0f83be88e5c710bf1c58301 SHA-1: 061109e8430e93ba4e4ae7fa0edcc281c0e80664 SHA-256: b3ec8c45522cb3e1df74541c961011b756c95cd00ce17d06848a26b35d449864
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely used for phishing or to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xezojetit.ru/strik?utm_term=aa+4th+step+fears+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5ff9abc4de3b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487191/normal_5fccdb0811a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479905/normal_602088736c96b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_604b0412e2afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_603b0154245b8.pdfIn PDF document text
    • https://numojuwavusori.weebly.com/uploads/1/3/4/7/134728722/2895810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481828/normal_6017687ca76bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5ff6582cb3c83.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/jOQhagj/guide_to_get_gems_in_cooking_fever.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_606c009f53010.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/gjjgQxP/85748102145.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/1480569.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/xghjijw/nisenifajemidofiwegirupor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_601f7454719a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_603e4ecb7db89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farowug/5._2_inverses_of_functions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/megegekafejenegonomuj.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/harry_potter_y_la_orden_del_fenix_audiolibro_parte_2.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/autocad_2007_crack_patch_free.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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 5068 bytes
SHA-256: da75ff61d436be536a1865323c9e2b5b23b05b3b4317f44d6d01d7e096574c0c
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10860 bytes
SHA-256: c3fdf5b3ade73122d7ac1e24d42ef5dc935b0cc335fbcfb8d2d8020fd80de081

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