Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3a6bc8fe871332…

MALICIOUS

PDF

90.0 KB Created: 2021-05-30 06:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c88d1ca7f382d085df73755c0fb2a729 SHA-1: 5ac025845d5ce7548f3bc759dde47f092856aac4 SHA-256: ab3a6bc8fe8713327fa74a62d50235e046bc6ed9e41ce5c59d8f2a9ae535d704
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=karnataka+budget+2018+pdf PDF link annotation
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/xupubafurukini.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/kazewexukuron-bozozesiman-sonoxepibati.pdfIn PDF document text
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/0494b12b2c.pdfIn PDF document text
    • https://jozitosada.weebly.com/uploads/1/3/4/3/134325699/a35f9b76b72.pdfIn PDF document text
    • https://jozimegif.weebly.com/uploads/1/3/4/5/134528335/tobunatubelo_fosafiloj_toxul.pdfIn PDF document text
    • https://zowunekufoz.weebly.com/uploads/1/3/4/3/134371229/c15ffdf7c661f0.pdfIn PDF document text
    • https://demujerifusa.weebly.com/uploads/1/3/1/4/131437649/madetogugagop.pdfIn PDF document text
    • https://fanofowos.weebly.com/uploads/1/3/4/5/134576313/sudoluzisu.pdfIn PDF document text
    • https://kawifapexevudo.weebly.com/uploads/1/3/4/7/134711131/bba73c.pdfIn PDF document text
    • https://pafirovax.weebly.com/uploads/1/3/4/6/134662293/xujobovepa.pdfIn PDF document text
    • https://xixekelubijaruj.weebly.com/uploads/1/3/5/3/135329585/efd06b37bdb2.pdfIn PDF document text
    • https://pizopivawot.weebly.com/uploads/1/3/5/3/135347149/43e0ba67747322f.pdfIn PDF document text
    • https://rukusipaxup.weebly.com/uploads/1/3/2/6/132683367/fiwenubatid.pdfIn PDF document text
    • https://gegosituvoxefo.weebly.com/uploads/1/3/5/3/135349754/5801015.pdfIn PDF document text
    • https://romudemul.weebly.com/uploads/1/3/4/8/134886817/6328976.pdfIn PDF document text
    • https://motubisirewu.weebly.com/uploads/1/3/4/5/134529252/22de6b9b256.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/5641089.pdfIn PDF document text
    • https://firebawoba.weebly.com/uploads/1/3/4/6/134659507/sogofomunukewa.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/piromosol.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/4348e.pdfIn PDF document text
    • https://lovizedisar.weebly.com/uploads/1/3/1/4/131437361/gebivonepo.pdfIn PDF document text
    • https://wifusewaxoxuxi.weebly.com/uploads/1/3/4/4/134497844/lazupobaz_vijesuluf.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/a95ed2c2-ec65-4a43-a2de-060bfe346760/grade_4_geometry_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e669d79e-3fae-414a-8776-3df4eca8f009/93809185968.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_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 5692 bytes
SHA-256: c7da4f74cc2536b9f9ac745f8d66090b7caa0f1b8543a012c56e46b2ec42e002
font_01_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 11176 bytes
SHA-256: 386a1bc9871defe48db4bfb7374cc38a86b67b56b9a460983f93e362731930fe

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