Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dcdefc8a0a95cd…

MALICIOUS

PDF

66.5 KB Created: 2021-03-01 00:07:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 187c8cf0a82b20a3d205f651c42e4ad5 SHA-1: 9c49ff30bd3c8884a087541c21d1fde16ae6c5be SHA-256: 81dcdefc8a0a95cd49cf6b0149a50f47b86a5939f587d4468fbfcdae55bd4be1
186 Risk Score

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://midufefew.ru/award?keyword=char+broil+red+smoker PDF link annotation
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/99db43587718d.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/9cf862.pdfIn PDF document text
    • https://binezorimitujux.weebly.com/uploads/1/3/4/3/134337637/7086423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_6016c0fb28421.pdfIn PDF document text
    • https://gafonubizaragu.weebly.com/uploads/1/3/5/3/135346264/b19b8bc24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425917/normal_5fe4adaea1ca9.pdfIn PDF document text
    • https://folitovuf.weebly.com/uploads/1/3/1/4/131406115/xofumofevu.pdfIn PDF document text
    • https://galevegu.weebly.com/uploads/1/3/4/5/134507196/2203742.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/cab4473.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/vemikivorajixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_6027eeefb6201.pdfIn PDF document text
    • https://sexojeno.weebly.com/uploads/1/3/3/9/133997780/586155.pdfIn PDF document text
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/finazososazufa.pdfIn PDF document text
    • http://mavpa.fun/how_do_i_change_the_region_on_my_samsung_smart_tv_20203amc7.pdfIn PDF document text
    • http://igme.site/kirunizegarunmlicj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fc8a02c57047.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/fadobirak/bosch_home_professional_washing_machine_manual.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_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 5176 bytes
SHA-256: 6ed4508d3ac040bcaf47ddb4fc2e06af8f4e8b864198e7015fe791b8fbe991e4
font_01_sfnt_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 10500 bytes
SHA-256: 57af99b55540fe6303fb0043a624eee489bd0ed40b34c42671ffebdf32828fe1

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