Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb775863d002332…

MALICIOUS

PDF

71.2 KB Created: 2021-03-02 16:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f9af37d461261730c99df4c4f1f8018d SHA-1: 4ddf60761f99481d33c2946a92e0d84ab9fd2888 SHA-256: 4fb775863d0023327fa3668f29fe397b1c5099c202feeb8e30e5a6298050ac11
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://kuzutuzo.ru/award?keyword=how+to+be+good+at+public+relations PDF link annotation
    • http://niburufajanuto.sportsontheweb.net/65894646385.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/Tgi7jet/audio_joiner_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/B6qFmih/31992573609.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/what_is_the_boy_scout_oath_and_law.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/hiehbLk/fefimatijatobomutixomurem.pdfIn PDF document text
    • https://cdn.sqhk.co/jexumumir/gcjbvig/duvokajuk.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/zoretuwulilelodej0iwko.pdfIn PDF document text
    • http://luminar4-download.xyz/kurtlar_vadisi_gladio_indirig0y2.pdfIn PDF document text
    • https://gojamomajaso.weebly.com/uploads/1/3/4/6/134616238/vumonaxobubar.pdfIn PDF document text
    • https://cdn.sqhk.co/kajemuwasutu/eCLEXhh/scorestream_alabama_high_school_football.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/what_trees_grow_well_in_central_florida.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/penale/development_partners_international_llp_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/sojujijomivixaf.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/sijijesuwenuditebeket.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_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 5436 bytes
SHA-256: 00e29675c030b013149adfaaebcfb40719e7adb178b076634240dfef2cd72055
font_01_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 10044 bytes
SHA-256: 99b517396e7c47675245cd4b381680099ef8b67769b0bc0ee6bea23b3c0e35d7