Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a99518fb7d17a42…

MALICIOUS

PDF

72.6 KB Created: 2021-02-28 23:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 77eb952f5444c635611fc19baab7d605 SHA-1: bdefad6707a0f251c3c2b1b2b6094b13d77ceda7 SHA-256: 0a99518fb7d17a4269461b231ab9b01a8ff9a4fe4d25f7e2673a5c028adef675
206 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://zajinet.ru/wix?keyword=hotmail.co.uk+sign+in+not+working PDF link annotation
    • https://perikoweb.weebly.com/uploads/1/3/5/2/135297066/sevuru.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/OYEjjgg/1261310209.pdfIn PDF document text
    • http://ziponep.22web.org/2002_ford_explorer_xlt_fuse_box_location.pdfIn PDF document text
    • https://cdn.sqhk.co/dasekizob/aTLIhjc/jack_adventure_game_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/jfjge5z/dwight_howard_net_worth_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/jgQ3NeP/planet_fitness_locations_in_yuma_arizona.pdfIn PDF document text
    • http://fujubipe.22web.org/87392478692.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofekelatek.epizy.com/radisopototurugozuk.pdfIn PDF document text
    • http://lekozuni.epizy.com/jalugimixavawovap.pdfIn PDF document text
    • http://rizokog.rf.gd/donkey_kong_tropical_freeze_boss_guide.pdfIn PDF document text
    • http://fasipubaweguguf.rf.gd/efficiency_of_transformer_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/75709953765.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/nojazenomobatawebefez.pdfIn PDF document text
    • http://pobuwejugu.epizy.com/movies_counter_zero_full_movie.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_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 5268 bytes
SHA-256: 420756255b476d37b113dfbae7696684edadb386fd95c2a47c774c4a81955dae
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 9932 bytes
SHA-256: ae15e1ca0f2928eb0b66a968a3686e05e6bedc40cbeecb5a6878a35836c73b89