Malicious PDF — malware analysis report

Static analysis result for SHA-256 2576952e39f11308…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 13:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e17c0d87de3f48b63af709e837a5334a SHA-1: eae36dc39dede4bcaf21181af7c4e19e9990ef46 SHA-256: 2576952e39f11308c827450e37a0023dc5836566bded536d8d010b0e7e2c0ff1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=management+by+objectives+system+definition In PDF document text
    • https://cdn.sqhk.co/bomemenun/TWia1xh/free_wifi_hotspot_app_for_iphone.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/ps_vita_memory_card_alternative.pdfIn PDF document text
    • https://vizejuvevu.weebly.com/uploads/1/3/2/6/132681979/2565589.pdfIn PDF document text
    • https://ribobuwatefinu.weebly.com/uploads/1/3/4/4/134469587/6859298.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/48747855185.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/dU0Mqjb/trivia_crack_cheats_2019.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/5766387.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/icOiigz/estimator_job_application_cover_letter_professional.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446272/normal_60316052411a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_60133fa687cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_602712a485226.pdfIn PDF document text
    • http://najisemure.medianewsonline.com/how_much_does_a_starbucks_venti_pink_drink_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/wwwgiij/webaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/bafumunixasadew.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/accordeur_guitare_acoustique_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/51011725972.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_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 5596 bytes
SHA-256: a2fd6db46b55e41e53c83cea70e4324a54491a47f0d5128a34131f668b768de2
font_01_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 9852 bytes
SHA-256: 40476486819d96e31d422ffdc1aa453f9d5032537ae2ea06ec3f8eaeeee94900

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