Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a53a9fd82e81d72…

MALICIOUS

PDF

79.2 KB Created: 2021-03-31 13:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 91846bda3d15b84bc8eb0d28ed35c1e1 SHA-1: 9cc58e50dd023206402beab4a58657df555f28cf SHA-256: 3a53a9fd82e81d72be953f6c4d2be3dae7411a0679dc7b495159078aa77e5344
156 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, with one pointing to 'vilenefex.ru', which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to generate traffic or distribute content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://vilenefex.ru/award?keyword=data+warehouse+and+data+mining+notes+pdf PDF link annotation
    • https://vomoxolakixirum.weebly.com/uploads/1/3/1/4/131438067/4530230.pdfIn PDF document text
    • http://igme.site/meritnation_cbse_icse_more_free_live_classesz12lj.pdfIn PDF document text
    • http://fito4ka.xyz/51620548943hjk8f.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/c824f70df42.pdfIn PDF document text
    • http://tiktokhd.design/build_woodworking_workbench_plans5tf15.pdfIn PDF document text
    • http://podeves.xyz/melhor_aprender_ingles_britanico_ou_americano2fsns.pdfIn PDF document text
    • http://keksik24.ru/60147081268llc1x.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/zagubip/1454700737.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/lugopesoroborul.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/tezogoponuvek.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/ferrari_488_pista_for_sale_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/46162316074.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/ejemplos_de_dialogos_formales_en_frances.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/gender_pay_gap_reporting_2019_hmrc.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/renim.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/kuxezevuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/barracuda_backup_390_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/simple_examples_of_classical_conditioning_in_everyday_life.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_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 5516 bytes
SHA-256: 84d71b64e490ccecfbe8284ea4e82c19f3ec5f4f02dfe7799610854b083c22ca
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 11704 bytes
SHA-256: f3061f727b1613731cfebf00e9079174e15f4f8d3973084ad4b7c4c00f1b68d7

Open this report in the interactive analyzer, or submit your own file for analysis.