Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a262af2348f83ff…

MALICIOUS

PDF

85.3 KB Created: 2021-04-07 20:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 507a011f1320219668139725255da659 SHA-1: 95d629a2f1b2433a9b84bc59c839186b4ab918e0 SHA-256: 3a262af2348f83ffc4456253425af35175fba2230a0caf92c26c5e6e56845a6f
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, characteristic of a link farm designed to manipulate search engine results or direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=what+does+bear+mean+in+native+american PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445333/normal_5fccb98dcfcc1.pdfIn PDF document text
    • https://towimoni.weebly.com/uploads/1/3/4/3/134340956/faferufepizasu.pdfIn PDF document text
    • https://wawotixivawipi.weebly.com/uploads/1/3/4/4/134474061/8620df8babf.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/reratedozimi.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/8809221.pdfIn PDF document text
    • https://sanufelileme.weebly.com/uploads/1/3/0/7/130775971/0c3f8600.pdfIn PDF document text
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/tasawiwarisupu-jemotokuxigari.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/misilajo.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/visibajuzava.pdfIn PDF document text
    • https://nazorilorapumug.weebly.com/uploads/1/3/0/7/130776423/a2d95.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/3164970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_6069c721e67d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5fd644075e317.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/kutep.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/0d63aadb-f5ea-43f3-818e-4428505dbfed/ancient_greek_art_ks2_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/how_to_scan_documents_on_canon_pixma_mg2520.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/windows_10_version_1903_full_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/jeduxuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36eb37c-e5e1-460f-8d11-d63c60e364d2/badezitixilopikupelaxim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c3a14d-db48-4f5c-9720-4050ae535ea5/63648670753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1f7e13-376f-4114-ba29-89aac54fd074/vertigo_mp3_player.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_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 5360 bytes
SHA-256: 9c52ac36b543638eb25d265d406c165261b69a00dc05b5385b7f69791f3b95d5
font_01_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 10904 bytes
SHA-256: 355609b4452c156e3be1e23d8fc184008411317cd6d96886149883a0c3dcb669