Malicious PDF — malware analysis report

Static analysis result for SHA-256 7859d3166b535b6f…

MALICIOUS

PDF

77.0 KB Created: 2021-02-06 03:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 4d8a3d1239a2b15f08f3b22d08dc4c3a SHA-1: c40f73e6f5a8969f9d898ca983898c0e8ea09543 SHA-256: 7859d3166b535b6f745774bfd60271e390d4d946adbf7d4955a7445c0511c0b1
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://druttle.ru/wb?keyword=asbestos%20sheet%20vinyl%20flooring PDF link annotation
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/nubaxeju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450870/normal_5fde70d7d71d7.pdfIn PDF document text
    • https://gapepaweduli.weebly.com/uploads/1/3/5/4/135400658/f25ce9917c9b881.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupibi/yicjdos/nupalekorikowugorerifu.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/hcM8Nja/rivijisewexukimip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_5fdbaf9aa55c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5fd7f63f46f66.pdfIn PDF document text
    • https://fanamiwa.weebly.com/uploads/1/3/4/0/134013174/3914518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_5fe8aad093cb3.pdfIn PDF document text
    • https://voxukosobezut.weebly.com/uploads/1/3/4/8/134846839/1618347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_6001c84816bc0.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/3414061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5fff413a257f3.pdfIn PDF document text
    • http://help-bluebadgecenter.com/grade_6_english_module_teachers_guidevd936.pdfIn PDF document text
    • https://tinuvireredat.weebly.com/uploads/1/3/4/8/134864568/begigijedotu_xaxufatene_xudazifitajagij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 5108 bytes
SHA-256: a0db79002e17e796128de3b12de7d30e7c39ca37516fa0e7f803495e7d981d26
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 10504 bytes
SHA-256: 66d07444e415ab1b77c643bba192587a17c5380a4d7e18140ba7caaae7537726