Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee8aba28fc2ab89…

MALICIOUS

PDF

81.9 KB Created: 2021-06-12 17:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a62c10905025612ed798eeb896cd5713 SHA-1: 167a920842626f9b6585058dd35597deeb698c83 SHA-256: eee8aba28fc2ab89b6c6f1300a974b6e7eb174803af819d15984fd46199b0f40
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by an ML classifier as malicious. It contains numerous external links, including one to 'medvor.ru', suggesting it's designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure indicate an attempt to manipulate search engine results or lead users to phishing sites.

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://medvor.ru/pbw?utm_term=about+us+page+template+bootstrap PDF link annotation
    • https://tudaxuvogune.weebly.com/uploads/1/3/6/0/136082380/4492611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_60be5295c4fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_60102e995bdd3.pdfIn PDF document text
    • https://nonewufuro.weebly.com/uploads/1/3/4/3/134334506/cf788de5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_6042cb77a7248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5ffda80e4c86c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_6024a8172c9a8.pdfIn PDF document text
    • https://kisisegexorev.weebly.com/uploads/1/3/2/3/132302984/ff154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_60bddf13890b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_6062cbb8a1a9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/438c8b7a-127d-490f-8fef-e14ea216c603/the_crab_shack_menu_tybee_island.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/354becde-cb73-49b6-9111-5b17ac9a66e3/bijog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a95df17-7d9f-4c4d-add9-c39f7e686fa1/82392759964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33bac59f-e80d-41af-b6f1-76c0325ba3f2/zipilofetosefuzisigigomu.pdfIn PDF document text
    • http://natetusiwuwo.pbworks.com/w/file/fetch/144806808/what_is_a_theme_for_courage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39e374b-e66f-41ee-a39a-a131c9c7dfd6/xaxujamimavejamugoliw.pdfIn PDF document text
    • http://jagimikat.pbworks.com/f/resafufizegalemogotixuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ebc1e00-d38a-47a0-9d19-c69b97647890/40651440954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc2828b-d000-4300-aea5-aa0a6740e744/trading_price_action_trends_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c78936a-a283-4529-b226-d605742a5ddf/que_significa_el_como_agua_para_chocolate.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_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 5268 bytes
SHA-256: 8b4f896ada8105f08b523b65007548354b02168447d58251e9ed3f992ec432bc
font_01_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 10560 bytes
SHA-256: 82c1826104ad47a660a505187470719dbf7842a6f4c110516b2aa83fdabb7fc2