Malicious PDF — malware analysis report

Static analysis result for SHA-256 c758d169b342401a…

MALICIOUS

PDF

80.7 KB Created: 2021-03-19 12:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77f27fe1d32df7c5d1b1c246d114d7ad SHA-1: 94b6f046a6e3b87146831706e4ebf6d115106a9b SHA-256: c758d169b342401aeb742215769013b39b27df7929c3f164c127a432d29f0092
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL identified as https://mezovuduw.ru/strik. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, contains text related to a product search, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=nordic+track+skier+for+sale
    • https://cdn.sqhk.co/kufagilan/jfnKhbo/7323788557.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd6527c8f6f7.pdf
    • http://wutopezogegusi.getenjoyment.net/vespa_px_150_manual.pdf
    • https://cdn.sqhk.co/kajurineg/haFZ0jf/fipoxigu.pdf
    • https://cdn-cms.f-static.net/uploads/4448540/normal_603b705d31a33.pdf
    • http://shopbest.online/java_jdk_8._2011hm0z.pdf
    • https://cdn-cms.f-static.net/uploads/4463803/normal_5fd13ff6e40ea.pdf
    • http://leyloften.online/25701372994hkv9c.pdf
    • http://sodahub.pro/anastasia_once_upon_a_december_piano_sheet_music6d7qi.pdf
    • https://cdn.sqhk.co/kerutadit/hawPija/human_services_professionals_jobs.pdf
    • http://kostlike.site/skyscraper_movie_building_designafsx5.pdf
    • http://ionatr.space/37825201859qpfld.pdf
    • https://cdn-cms.f-static.net/uploads/4384046/normal_6047d1f170495.pdf
    • https://cdn-cms.f-static.net/uploads/4498376/normal_600a2497c4301.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jasosuwer.epizy.com/delegation_board_template.pdf
    • http://wupumodo.epizy.com/zatikubasosajizeliveb.pdf
    • http://rulafiserize.rf.gd/32321478958.pdf
    • https://s3.amazonaws.com/tidigudetefumof/beach_buggy_racing_apk_for_pc.pdf
    • http://rifufogasuser.rf.gd/78879409306.pdf
    • https://s3.amazonaws.com/ronenitevodo/adobe_stock_indesign_templates_free.pdf
    • https://s3.amazonaws.com/bizamesuwepe/baptismal_class_manual.pdf
    • http://xufoziminep.onlinewebshop.net/sovavawekakexeviwasexow.pdf
    • http://naxefugoxodikow.atwebpages.com/vorifekebimevidefidu.pdf
    • http://suxaremulemafet.epizy.com/persona_4_golden_is_it_possible_to_max_all_social_links.pdf
    • https://s3.amazonaws.com/faluzotixupi/guided_dove_hunts_california.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd2.bin
97902a4361c3d646c7f758bc4c04f99f461a97753497a04b185e33def65af6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 5048 bytes
font_01_sfnt_off00010d13.bin
bf840167630d3603be0bea44f9df4728a9637d9cdc0f96f5b9bd9bdf8ab4d119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 11368 bytes

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