Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8aab7c51d8442cd…

MALICIOUS

PDF

76.4 KB Created: 2021-04-06 02:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d9ef9ebdb6cafedc17eb6b3a304ac185 SHA-1: d299d27b33c95a236e8d6b0e5ce7dbd0b394bb93 SHA-256: c8aab7c51d8442cd2f60228283fb3ea784702f18b98894178ef63da840a560cb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'seumenha.ru/award', suggesting a lure for users interested in literature. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such links, reinforcing the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely serving as a phishing document or a downloader for further payloads.

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
  • 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.
  • 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://seumenha.ru/award?keyword=canela+de+velho+literatura+pdf PDF link annotation
    • https://cdn.sqhk.co/gejixoneku/xhj3icG/56986438458.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/fjgeJie/titako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5fd652ac44bf5.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/kopunaxiluxewav-vepaj-vuvirobomozoj-gedafigiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_602f4004e8372.pdfIn PDF document text
    • http://zozitaze.mypressonline.com/kiwabanafafiso.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/gBjcLQ7/singing_machine_duet_karaoke_microphone_not_working.pdfIn PDF document text
    • https://vesexifog.weebly.com/uploads/1/3/4/4/134491049/5444091.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/80953804294.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/2352d762-f8ba-4049-8f20-27392cd4d538/48288520296.pdfIn PDF document text
    • http://juborekif.atwebpages.com/91294365072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16fe130-cda3-4465-a971-1b022c05d5d6/sadeloluvasif.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/gituwapefixujibemup.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/oxford_thesaurus_dictionary_free_download.pdfIn PDF document text
    • http://senawoxagijajo.onlinewebshop.net/91410213728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a151e26-6783-459a-9b02-a5b6cf6badf7/33813383219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de915a3-7117-465e-9b6f-b23c0619a0eb/rebibesubupirim.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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 4916 bytes
SHA-256: 18929c07edcf42c52f5ae11f5c75e8f0db62056320d76ab061a082599061763d
font_01_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 13476 bytes
SHA-256: 039a1e69743d988a42a09db8e8fe0cdd50effc50b526094973feec2f1e72e661

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