Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f426426c9955f2…

MALICIOUS

PDF

76.3 KB Created: 2021-02-08 11:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: f0dd83ff9f04214863348f24ac075bc4 SHA-1: bf9514caf2ab4d4b0b151b9e609b97364620b76a SHA-256: f9f426426c9955f28ea82ecb43b14b62a5111aaefa74178efc09620cbf6add02
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=learn+to+walk+before+you+run In PDF document text
    • https://naweviwezufas.weebly.com/uploads/1/3/1/8/131856142/rajag.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/cigkjab/21943630782.pdfIn PDF document text
    • https://gisudilepa.weebly.com/uploads/1/3/5/3/135346020/4757891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5fe4115d4ee87.pdfIn PDF document text
    • http://magnifioco.site/19985647597rvu5v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fc5d8f73e525.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/moruzazos.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/e8pu6gc/zodosun.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/sovoluj_xavatan_vivozenisexed_zeronarumeri.pdfIn PDF document text
    • https://cdn.sqhk.co/videbamez/qjdDfgj/78664384014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6020fc296c177.pdfIn PDF document text
    • https://sokijolixorinus.weebly.com/uploads/1/3/1/1/131163896/cfe0ca9a6965c4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5ffa6c15a2854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_601c61a097a41.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/xujitezu/wuromovejuxekulijeku.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_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 4924 bytes
SHA-256: 19717d2a1bb40ff9b4091fcf4327e3e2fdfb3ae9b9dd30a4e81e00931ec780b3
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10760 bytes
SHA-256: c7c0b006731ca45fb136e549274411193861a6b8b734dff62a0c9764f3a3036b

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