Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cfc84b08e0e86d…

MALICIOUS

PDF

74.0 KB Created: 2021-03-03 23:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f9f5734431e597784de4d9ef5bc7d966 SHA-1: 53d69517d25ce2af5063fba0528f550c2c794198 SHA-256: a5cfc84b08e0e86dbe40854a2091c91eb732be884427b379dfc682d9271f6d91
134 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one to 'gimoguvi.ru', and a heuristic indicates it's a link farm on disposable hosting. ClamAV detected it as 'Pdf.Phishing.Trojan', and a machine learning classifier also flagged it as malicious. The presence of a 'download button' heuristic suggests a social engineering lure to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/award?keyword=samsung+ml-2165w+drivers+free+download PDF link annotation
    • http://ladujose.sportsontheweb.net/is_a_2000_buick_lesabre_a_good_car.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_602faa2586483.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/inhhLqX/xidapigur.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/diccionario_filosofico_rosental_iudin_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/ejchijc/37728582318.pdfIn PDF document text
    • https://cdn.sqhk.co/towojutal/hYzZje5/city_of_commerce_clothing_warehouse.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/xozibodikaf.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/bh7y2he/882261019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_6026cb8a92f3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5fffa9e46eda6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_60078d0e397da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_601a9ec192925.pdfIn PDF document text
    • http://bofitek.iblogger.org/zojudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_600aef645ca41.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/4gjYuhg/xigadusozodegepekomeveti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_603400aea71b3.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/62495357971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujageritoxo.atwebpages.com/philips_series_5000_change_head.pdfIn PDF document text
    • http://goziwofa.rf.gd/canis_canem_edit_english_1_answers.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/sanyo_smart_tv_price_philippines.pdfIn PDF document text
    • http://laburebimefifal.epizy.com/fitbit_versa_lite_reviews_australia.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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 5976 bytes
SHA-256: c16ae2c40a39ad60638fd56c40ff3c35d7da643d7a82b21fc1a33961ce995a3e
font_01_sfnt_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 10060 bytes
SHA-256: 2870ca08011245038b9896573153b35df5a8b075c9ea3fac24af48a1eca4c244

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