Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4922b85d4b3b994…

MALICIOUS

PDF

75.0 KB Created: 2021-02-20 11:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: f07c16ad4b760d6ed03f3bb96ce295c4 SHA-1: a19d829ef7d0e2b3beb6eae2b0741cf4ad734ad8 SHA-256: c4922b85d4b3b994a603761d8d9f858718286d048a9ea3b4002d3193bff7b403
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://crophysi.ru/aws?utm_term=how+to+connect+a+plantronics+headset+to+a+phone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_602474cab75f3.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/ichhM1i/lewigebis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501975/normal_5fe15dd8cadde.pdfIn PDF document text
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/mijujowosoxor-xarefimudeg-zexafegon-xipuduwojomudoz.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/IRherhi/jukemawovisugef.pdfIn PDF document text
    • https://zomuwobab.weebly.com/uploads/1/3/0/8/130873958/nufawisejan_nojifot_tozar.pdfIn PDF document text
    • http://zabidegelid.iblogger.org/57481478094.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/sowibhe/harkins_theatres_movie_times_yuma_az.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/bivoruwomal.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/3636241.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/3736287.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/GggwjaI/16247770103.pdfIn PDF document text
    • http://devovonabukuzim.66ghz.com/nodujaterobemokox.pdfIn PDF document text
    • https://lupirolawa.weebly.com/uploads/1/3/1/4/131453436/99ea17b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobexegedun.epizy.com/pabazetiselavidamoneso.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_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 5212 bytes
SHA-256: ee6289843b6f27016bbceb4fc684f185cce044bb363fe688e2054f2b51cef6a4
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 11144 bytes
SHA-256: 707c2c792e8feebf28c7926e977c8e8ff9b4bd71b5b80c9b715f4c66ad0e1500

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