Malicious PDF — malware analysis report

Static analysis result for SHA-256 565a301b3cbc166f…

MALICIOUS

PDF

75.4 KB Created: 2021-02-06 18:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7e673b94cdd4967654de8b49c57798ed SHA-1: 48e1b387e67b544c76fed493f40f7e24430052c7 SHA-256: 565a301b3cbc166f33b1c322026383d8b3e47ce8d2e87a80973a33280b1dd8b7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards techniques used to redirect users to malicious 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://maypoin.ru/123?utm_term=13.3+dna+replication+answers PDF link annotation
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/4826c09bad6f.pdfIn PDF document text
    • http://sabuxaki.22web.org/crossovers_by_powgi_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462035/normal_600b799d895ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472773/normal_5fff5f4800c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_601e4bcee7cf4.pdfIn PDF document text
    • http://vinuporabomod.iblogger.org/heart_disease_prevention_fact_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5ff8d9c6e4ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_5fd60f02ca1be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497697/normal_5fe70b88a5fe8.pdfIn PDF document text
    • http://poxexududojal.66ghz.com/comma_splice_grammar_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_5fd6490179be6.pdfIn PDF document text
    • http://gilogaviteno.iblogger.org/kovirimamobunipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388813/normal_5fc57030ac4ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekolaxoretewov.epizy.com/78936812215.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/chelsea_squad_2016_17_formation.pdfIn PDF document text
    • http://wetedezowob.rf.gd/konokomutajes.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/99046730585.pdfIn PDF document text
    • http://rulenanevatetid.epizy.com/auguste_comte_law_of_three_stages.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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 5312 bytes
SHA-256: cf5e038d6de5beeaabe6dbae2d3cce0af7a2ec23ec4e2427c1cbedf035c3f98f
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10260 bytes
SHA-256: 5958689b83efb0dd1bc554284071faccc69103c581f936af055251c8d41e3d61

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