Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c4852a9a8268d…

MALICIOUS

PDF

80.6 KB Created: 2021-02-20 20:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f46c0d84fd91f3aac306d8057fd63830 SHA-1: ed0ad9714869e33eb5c3edc6e8d5ab87ce830d14 SHA-256: 856c4852a9a8268d5a36c64266830c6ded9c2ba7a93808b00055640482ae888c
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including brand impersonation for credential phishing (Spotify) and a link farm. The embedded URLs suggest an attempt to redirect the user to malicious content or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dozowogan.weebly.com/uploads/1/3/4/0/134098910/tedenoli.pdf.
  • 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://maypoin.ru/strik?utm_term=roku+model+3920x+manual PDF link annotation
    • https://dozowogan.weebly.com/uploads/1/3/4/0/134098910/tedenoli.pdfIn PDF document text
    • http://remontlegko.info/akateko_to_spanisha0wqr.pdfIn PDF document text
    • https://cdn.sqhk.co/fepebage/jaNx9jf/stranger_chat_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/xgicFha/stuck_on_war_table_avengers.pdfIn PDF document text
    • http://eeeeeyyy.space/mitikegozuzade9nc91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_5ff9fc4fa89cc.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/hjoibcL/live_cricket_match_software_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/dufadafakuti/hDgghhi/68927491418.pdfIn PDF document text
    • http://becloud.website/mksap_vs_medstudyxxzrb.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/Nn2rjag/survival_at_lost_island_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/5thh4W0/blazing_star_plant_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/hfgcBuY/73815521934.pdfIn PDF document text
    • http://kzrovk.xyz/88204226478mfqri.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/debamijizozexo/fuxuvuvubulufe.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/toxolazuf.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/13529096495.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_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 5432 bytes
SHA-256: 58a450824aaaf045cd497baab1f5f7085040cce940dee2eb78a92a39a04e6298
font_01_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 11048 bytes
SHA-256: d96aa13000b8cd91a6b2237df02c910c7ca917ad0f4348706da2a26f890c2a71

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