Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a88987c67aabe4…

MALICIOUS

PDF

76.8 KB Created: 2021-02-24 21:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 01ba36491fcd6fdd30fc82158c6f04d2 SHA-1: 6bcd1c39ccd54533d49bf28cc64961afda0d93af SHA-256: 25a88987c67aabe4a455ed96398e66abcb57ce46792c4e6cf47761d44086c69b
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for link farms used to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

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://baarspo.ru/strik?utm_term=predicas+escritas+sobre+el+poder+de+la+oracion PDF link annotation
    • https://cdn.sqhk.co/votezevon/jfiacgi/earth_wind_and_fire_fantasy_release_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_6035c0c3bbc1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489259/normal_6022b07a85999.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/2655177033.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/gYie2lx/zovukiwogegimexutel.pdfIn PDF document text
    • https://cdn.sqhk.co/vuguvorexi/ifW1ST5/t-_mobile_coverage_map_west_virginia.pdfIn PDF document text
    • https://pekidajisin.weebly.com/uploads/1/3/4/4/134476355/sowutudibijusibi.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/icUfnTB/kusewutujotagoraxidutem.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/Hjhrjip/sonic_adventure_2_battle_dreamcast_mod.pdfIn PDF document text
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/lulopafisavov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_60270af261c06.pdfIn PDF document text
    • https://zorimogitew.weebly.com/uploads/1/3/4/4/134487520/xopugugemizuzag.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/jicZpM4/911_call_simulator_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumurulepowele.myartsonline.com/apple_ipod_shuffle_4th_generation_waterproof.pdfIn PDF document text
    • http://wapudajikipidem.epizy.com/bomogetafupexatuvas.pdfIn PDF document text
    • http://jodonurinifos.epizy.com/fotawofabut.pdfIn PDF document text
    • http://nixaruxabonijiw.rf.gd/jekizexuxobenugubina.pdfIn PDF document text
    • http://bofiragomux.rf.gd/honeywell_t5_smart_thermostat_installation_manual.pdfIn PDF document text
    • http://kibululugavi.epizy.com/free_ms_word_tri_fold_brochure_templates.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/coway_ap-1512hh_hepa_air_purifier_reviews.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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 5208 bytes
SHA-256: bc10d96b4924b8117c5d6a9d33f8d5147db3358944cbba1c1f14596c9803000e
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 13748 bytes
SHA-256: e85a26cda253f97054e7d09b83ff984be3e2ccdf434baff24c165e7d9ab48cc9