Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c0ba4c7b819054…

MALICIOUS

PDF

78.3 KB Created: 2020-12-02 18:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0e07f455f818409368eb4dcb3756b4d2 SHA-1: 93c48141d9d25751117c093d48d432cdb531a0bb SHA-256: 39c0ba4c7b819054ba377d3f255fa1e152c9da38c7e4d07f34e2e648c6018e98
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-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.
  • 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://traffking.ru/123?utm_term=black+sailor+moon+cosplay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5f8d12c0a09b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_5f9b9e04d8f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_5f8cbe7957ff0.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/666d48.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/5fbcf065dae50a01458606cd/1606217830309/libewale.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf603d3c6ccf69f3561401/1606377534264/nba_live_97_michael_jordan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5588a97599144eee4d6c/1606374792362/cps_student_code_of_conduct.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6a9a1972c46e3c9730a6/1606380189190/scholarship_opportunities_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1057cc30a162e0c5324ce/t/5fc51cec5147b14804d58644/1606753516277/razejip.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1d68173fb5383b6aacab/1606294889125/xugosobidukodujilesejax.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdefd46457125654ff256f/1606283220591/usb_gx_loader_not_loading_games.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1e00e6d49a06bb59f7f7/1606295041836/split_toe_shoes_parkour.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc654295687f52b6ba616b7/t/5fc72b18efc65c5b7a3dc127/1606888216998/8060588146.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 5292 bytes
SHA-256: 387559b82b4c2ac92da28999f1f49687b9263d431e96df3b5c7631598fb121bb
font_01_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 11080 bytes
SHA-256: d4751cc23d36eeafaee2b51b19c4dbb2b2969198c366898b4dd96f0cb565ad9f
font_02_sfnt_off00011687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 16164 bytes
SHA-256: 0ddbdf075a6b93c30840c956f82c28930afd570615945c5f10d387cf6e2c8926

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