Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2eb5b494552f253…

MALICIOUS

PDF

91.9 KB Created: 2021-04-09 05:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdff6c43cb32d9174cda8b2dd1a7ce9f SHA-1: 51efcc4a85ec1586a17d12c2c8c4aaa5302020d9 SHA-256: d2eb5b494552f2533f75bd8fa735bcf01ac499edaf337c8c327625ed63aa706a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://vilenefex.ru/strik?utm_term=how+to+tell+how+old+kitchenaid+mixer+is', appears to be a lure for users searching for specific information, likely to redirect them to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+tell+how+old+kitchenaid+mixer+is
    • https://cdn.sqhk.co/nedabuke/0G7J0ii/gafutekafonowe.pdf
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/3042292.pdf
    • https://static.s123-cdn-static.com/uploads/4414691/normal_5ffae9890e80c.pdf
    • https://cdn.sqhk.co/vobevufubito/rhdgduR/dremel_accessories_guide_poster.pdf
    • https://vubosetupis.weebly.com/uploads/1/3/4/5/134594606/4ccadb627d80e.pdf
    • http://bexixibeguben.sportsontheweb.net/jadotoxovipigafijas.pdf
    • http://jiteruruw.sportsontheweb.net/important_current_affairs_of_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5fc854fed3f58.pdf
    • https://cdn-cms.f-static.net/uploads/4485329/normal_604ad032ca3a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_ffc5456e36b744d28dd6292dc24bb3b5.pdf?index=true
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_b3ee7983074c451abfbdc00c12b5b887.pdf?index=true
    • http://kenesowozowojaw.myartsonline.com/deductive_and_inductive_reasoning_in_math.pdf
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_1e9e05a221b942328c4f707014342377.pdf?index=true
    • https://da25564d-e3c2-4b9b-87ba-dd8ce2ae78d4.filesusr.com/ugd/c82cd6_cb785d186d0f48528de628150f85179a.pdf?index=true
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_ac35081634c64bbdbece56795cb49a5b.pdf?index=true
    • https://09af0a6c-c0e6-47ff-90c1-5b173435ccd1.filesusr.com/ugd/b92b66_3eacdb394ec9416bb6b607c5ba0f0db4.pdf?index=true
    • http://sopavame.onlinewebshop.net/introduction_to_automata_theory_book.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_off000125e5.bin
2d4723782864be5a410b0e36dbb84d982549a62ca6df3c1d59ec8047c0aa88b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 5364 bytes
font_01_sfnt_off00013801.bin
1aaee0bc3f236ab3728798ae37afdcd81d711774ce7be81379bffbf336c4a645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 12572 bytes

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