Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0bbd16d0b3ed9a…

MALICIOUS

PDF

65.6 KB Created: 2020-12-04 10:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c2de75d6999f070ad194d6067d63adf1 SHA-1: d27eea1a825d72c64f442c6f4d0f2f9d532fda6f SHA-256: cb0bbd16d0b3ed9a22bb012c8f0b32183951b3c59a1021124cbe1ed95c1be6a3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=purdue+owl+resume+objective PDF link annotation
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/bf8c0045620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_5fb39c55ae6cd.pdfIn PDF document text
    • https://susetizumuru.weebly.com/uploads/1/3/4/4/134461935/1f9af99bc63e1b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5fa1de41d20d9.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/mibikapunimuboselel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf15364a3cc4058a3636d/1606218087435/webeju.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/zugifuxafewomeboxiteke.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcef3364a3cc4058a32810/1606217523915/pathfinder_shield_master_build.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1ed99b7bfd15107cbba3/1606229721679/51962885384.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/tepunoberir.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/1578794711.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/norukopitutomizug.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/xavetabidemexikaruk.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/email_signature_template_outlook_generator.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_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 5244 bytes
SHA-256: cc5fdaf865a23b19b5c15bf665f110a412b621a86d752d96f0e7b8649ab26c16
font_01_sfnt_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 9940 bytes
SHA-256: 74b85fbc201f61999f5c8b88d4bf9c2e5949441002c756f6fcc2478442139fad

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