Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6678200f3d7208c…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 01:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5f690ecc9c45daf7b1ec77fb84e21244 SHA-1: 78442cc82cfdee807825ed2b522a72bbfd9d0624 SHA-256: b6678200f3d7208c144bbcec857bc720cc099aedce9c88669f70f4979014ada2
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with many pointing to disposable hosting and one specifically identified as a malicious redirector. This indicates a likely phishing or spam campaign designed to lead users to malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=peter+pan+and+wendy+cast+disney+plus In PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_60417bb9a2ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_604caa3094f6b.pdfIn PDF document text
    • http://reveruverof.medianewsonline.com/thomas_finney_calculus_9th_edition_solution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501996/normal_600c472baef7a.pdfIn PDF document text
    • http://mibijuzorifif.getenjoyment.net/building_bye_laws_bangalore_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_600f2d55c68a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5ff42881ac5f9.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/63644144915.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/dagadizinulowetimudifoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_601236d1211e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_60522b567eac6.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/86156100489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sinusudixuxuwad.atwebpages.com/jufezinonoxededijop.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/83550070614.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/64202226348.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/divergent_book_report_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/aatish_video_song_3gp.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_93ecfb4120284a84a7593145587b3a3e.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_0fad1dab8bbb4194b22cb728096f3872.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/nofedatujojapiz.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_1e651e752d204707b236aecaac3d5ff2.pdf?index=trueIn PDF document text
    • http://zowofiz.myartsonline.com/15554318198.pdfIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_f4fa59b8474f41688a702ccbb4eb105f.pdf?index=trueIn PDF document text
    • http://wokidomogu.onlinewebshop.net/81562215551.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_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 5260 bytes
SHA-256: 49c0301adb72d88c0934dbbccadabbf60b26c402b2d9b99990460a73e353e1b9
font_01_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 11184 bytes
SHA-256: 55d99c99647f4fb6a244149708ad85dbcec268294aaac84b6842b10bd7a08907