Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fb8fd4b033b561…

MALICIOUS

PDF

76.7 KB Created: 2021-02-28 16:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7dc088cee3c54c7a80769619f8d97634 SHA-1: 720f5c3e023a408f39c69ad8867b8f0e26cba0d4 SHA-256: b3fb8fd4b033b56167081858c77fe5831ad5af5890e068a6f7fc410038f1bf24
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The document body, though heavily obfuscated, contains keywords related to driver downloads, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=hp+laserjet+3015+driver+windows+7+64+bit+download PDF link annotation
    • https://cdn.sqhk.co/zoburawava/hi6Uja4/13010238647.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/IPWhgF1/60340163931.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/zgiehhU/4895830216.pdfIn PDF document text
    • http://bezugunafagomup.22web.org/how_does_i_am_the_messenger_end.pdfIn PDF document text
    • http://bagabipum.iblogger.org/18298972777.pdfIn PDF document text
    • http://uscarinsurance.info/698871419509glt6.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/how_to_get_sound_on_acer_monitor.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ciafhJf/zopoxelu.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/6jbFjhf/pocket_mine_mp_sur_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/8hd5geP/pevotig.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/fmzVNCZ/skyscraper_construction_tower_sim_3d.pdfIn PDF document text
    • http://cyberghost.store/wifi_channel_analyzer_mac_freeoslj6.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/11129784150.pdfIn PDF document text
    • http://gratoram.site/nusetoreramanurokpivi6.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/jagiST9/24463022055.pdfIn PDF document text
    • http://vanlit.ru/product_backlog_user_story_templatedyypw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jufomotapi.epizy.com/47932848064.pdfIn PDF document text
    • http://bibikefogive.epizy.com/how_to_reset_a_hunter_pro_c_sprinkler_system.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/avg_free_windows_7_home_premium.pdfIn PDF document text
    • http://zevizajezu.epizy.com/genesys_workspace_8._5_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/15954553666.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/rocket_stove_combustion_chamber_design.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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 6084 bytes
SHA-256: 18e629d52e92d712a860e881aa3d9ad1d8152581fa0c4c7d4a138360a76f91d9
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 13540 bytes
SHA-256: a3ac39792d13051c77844cfb19c9bb88afd292b8d6934e4a1a79abbccd7682ec

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