Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d5971b2f51f368…

MALICIOUS

PDF

77.9 KB Created: 2021-04-02 05:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 50cecd416bcd896248dccd4e8ef50c81 SHA-1: d99c9d7dd0185c461fffacb6fb380844514bb779 SHA-256: 92d5971b2f51f3684cbbb4faca15dcca39902dbc7a31e67a6401267a5f979d1d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of an SEO spam or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=java+8+certification+books PDF link annotation
    • http://stnold.com/guwedebxucz.pdfIn PDF document text
    • http://pixelbarista.com/misobemuvbbkx8.pdfIn PDF document text
    • https://zetovesejideze.weebly.com/uploads/1/3/1/4/131482946/948115e850f1.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/6036061.pdfIn PDF document text
    • https://fubolilodizewe.weebly.com/uploads/1/3/5/3/135312413/8896fa122.pdfIn PDF document text
    • http://denaguful.iblogger.org/selling_skills_assessment_questionnaire.pdfIn PDF document text
    • https://vuxupiwiruxip.weebly.com/uploads/1/3/0/9/130969000/3224000.pdfIn PDF document text
    • http://kmplitka.shop/crime_simulator_3d_real_mafia_gangster_apkpurewldnf.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/352734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_c9f9f72cd56241d68289544e9c165333.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_ad0c57a700c84a93843897259abc5b4d.pdf?index=trueIn PDF document text
    • http://xakagigoneliv.myartsonline.com/mavufak.pdfIn PDF document text
    • http://pawuzax.onlinewebshop.net/fexut.pdfIn PDF document text
    • http://kemixirutuj.epizy.com/how_to_repair_hearing_aid.pdfIn PDF document text
    • http://zedowep.atwebpages.com/4453995141.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_c81a9ec8324e4ddfb772560f7ec30470.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_89c3ba72f5594307a3287680113dcfb1.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 5288 bytes
SHA-256: 922c46c0fe0586f5e5ae97a4d1937232879077035b1c5ce95f373ff2e1b223ac
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 10464 bytes
SHA-256: 8cb9eead1be38dd5ba9f0432ac2bb06ddefc7a6b677c454413f082bb7a72b97e

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