Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfba6807f437202…

MALICIOUS

PDF

76.1 KB Created: 2021-03-09 14:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8570a47edc4f1b09ac2cdf29111b523 SHA-1: 83d096f22425ca804951a34e4d12bd7e33c6ce85 SHA-256: 6cfba6807f4372023f01051194eca07f5d3bdd80b5156f566e2b84b0c6c72c30
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and a specific URL related to Excel formulas. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely for SEO spam or phishing purposes.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=all+formulas+in+excel+2020+pdf
    • https://mukoxawav.weebly.com/uploads/1/3/4/6/134627731/wumibejobel_difal.pdf
    • https://nonedavoxezi.weebly.com/uploads/1/3/5/9/135956696/7365587.pdf
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/9d4cc4a1512.pdf
    • https://finenomasawovep.weebly.com/uploads/1/3/1/4/131437785/luxisafonira.pdf
    • http://help-nanny.site/6076711120572n28.pdf
    • https://benadegerabo.weebly.com/uploads/1/3/0/8/130874398/9729839.pdf
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/wosizipar.pdf
    • http://gk-kuban.ru/55262079026n8y2i.pdf
    • https://vetedikagumon.weebly.com/uploads/1/3/1/4/131453784/kojuwuwapalogepijis.pdf
    • http://lestyprin.online/jodabate3195l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://witigunakejawi.rf.gd/el_sueo_de_una_noche_de_verano_caracteristicas_de_los_personajes.pdf
    • http://ropipowewigu.epizy.com/tasawepirabafefu.pdf
    • https://uploads.strikinglycdn.com/files/cbc88419-cd76-4e8d-a654-2c6b719f2808/retanotugoxebavupe.pdf
    • https://uploads.strikinglycdn.com/files/fc39c4e5-df2a-49a7-a07a-ecbb1fccd158/97346038850.pdf
    • http://fipinajamidab.epizy.com/35690817825.pdf
    • https://uploads.strikinglycdn.com/files/90318818-d173-4e46-bb67-4600f83d7852/how_to_use_poisson_table.pdf
    • http://mifazafodig.rf.gd/jupefesavidipidebijadad.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_off0000e9bb.bin
3e99fc142822ebab7a0bfabe58e84fe8145a6f004ae851b1f16387cb8616bd54
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 5632 bytes
font_01_sfnt_off0000fcce.bin
20d2712f2b53b7f32aec1fdc36b70ded7270023497434ad46d366949ad89279c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 11244 bytes