Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbade53c7d7834c…

MALICIOUS

PDF

89.4 KB Created: 2021-03-03 11:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d0777e50316b2d537645b9447298754e SHA-1: c4f307fdec43d2f973c65811697db24721acff3f SHA-256: 4bbade53c7d7834c09d55b0f819b0a5769e0dd85b7834a5efcd65d93ddab68f0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a link farm. The primary URL, https://vilenefex.ru/strik, suggests a potential phishing or malicious redirection attempt. The presence of multiple links hosted on disposable domains and cloud storage further indicates a tactic to obscure the true malicious destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://vilenefex.ru/strik?utm_term=the+selection+cass+kiera+cass+netflix PDF link annotation
    • https://movalolutipala.weebly.com/uploads/1/3/2/6/132681002/javaximalefodegagob.pdfIn PDF document text
    • https://cdn.sqhk.co/mobobelelu/hjgdjhF/words_in_a_pic_2209.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5fc6192d78e95.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/UhdmfcA/istanbul_devlet_opera_ve_bale_mudurlugu.pdfIn PDF document text
    • https://cdn.sqhk.co/fivuwunar/LjgQ6nj/31322511102.pdfIn PDF document text
    • https://rurinigumiza.weebly.com/uploads/1/3/5/3/135350695/023ddd654.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/hghejgS/52684961766.pdfIn PDF document text
    • https://cdn.sqhk.co/dobopejig/icuxhfO/tomboy_skins_for_roblox.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/how_to_clean_a_broan_range_hood_filter.pdfIn PDF document text
    • https://zogabugopevaluz.weebly.com/uploads/1/3/0/8/130814784/somozutowozus.pdfIn PDF document text
    • http://islemleriniz.org/54552488214c1dw5.pdfIn PDF document text
    • https://dibufasefeduvit.weebly.com/uploads/1/3/5/9/135975636/9229788.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/dovetuwisopizolox.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/how_to_turn_wii_u_gamepad_screen_off.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/wegemebufojafak/70316170386.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/vector_addition_by_components_physics_classroom_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/61112660719.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/79926167805.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/negaxeniditupokix.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_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 5048 bytes
SHA-256: dcc2bf8c1112bbfda74bdc18a0942b65d6b1ce6309cc3874a75d1ac59254c118
font_01_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 11044 bytes
SHA-256: b62ff953d6c5dfba9565f2b6f6e3140df1e654835dfa2a6f3cbb6e60e280d048

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