Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be9efce3752dd4d…

MALICIOUS

PDF

85.4 KB Created: 2021-05-28 16:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 25a913226ad0868aaf48acaf0869b75d SHA-1: 57a110d2394ee21e2c4204ae1b27156ef7138c00 SHA-256: 6be9efce3752dd4d030f45770f89bcb765601bd91af3a99e65f5bac04b553042
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to reference 'Cobra Kai season 3 review spoilers', suggesting a lure to entice users to click on the malicious links. The presence of multiple PDF links and a critical ClamAV detection further supports a malicious classification.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=cobra+kai+season+3+review+spoilers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_6007525a36244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_6033cde7e64cf.pdfIn PDF document text
    • https://tefawizudarezuf.weebly.com/uploads/1/3/4/6/134640126/0901cef4db1f.pdfIn PDF document text
    • https://mozapimijovami.weebly.com/uploads/1/3/4/6/134661863/9673503.pdfIn PDF document text
    • https://dazarurizupe.weebly.com/uploads/1/3/1/1/131164120/48a4aa6ca5d6135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382619/normal_600144cf9bac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_602a9faccd328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_6046649813b1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418762/normal_5fc851a23cca9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_6009380494db1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492892/normal_5ff602630a0c1.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/jusizubivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_5fffba38025ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_5fd124f536278.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/74b8c0878dff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_6008b700bcc1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_606c5dc48843d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4e0a8c-a340-4dc5-973c-2c70934aea88/fukemokidululafetevep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac162b38-60c3-4cff-ae96-e3162468ed36/demevalonirigomex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13124c02-6d6a-4c42-af28-291f6e51cc02/lista_de_palavras_derivadas_e_primitivas.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_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 5236 bytes
SHA-256: 8376dffbf0c0b90a63a19df38e38b70b27fc3a3571a09abab8b51f67080142b6
font_01_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 11636 bytes
SHA-256: 8ba8c5ee08ab12c7c6a90d9fa11a3f3186ce7ea6870e3fac494c9f5ee6af0351

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