Malicious PDF — malware analysis report

Static analysis result for SHA-256 039647ba2857f5c6…

MALICIOUS

PDF

78.1 KB Created: 2021-03-26 14:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63c2bd5656f1f81a147b35edc20c3997 SHA-1: d14304e83fe1694528847ac2fff49acc7d0c10cc SHA-256: 039647ba2857f5c600d3da4691d5dfd9bfcdb9bbfaecf5d057a801274e95968e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The primary malicious URL identified is 'https://ponafet.ru/wix?keyword=bill+of+rights+bingo+scenarios+answers', which is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=bill+of+rights+bingo+scenarios+answers
    • http://jusolul.22web.org/rogakurage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/buponuwebi/dark_souls_2_strength_faith_build_pve.pdf
    • http://ruraduwajisiv.rf.gd/engineering_design_report_introduction.pdf
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_079cc66173a5481f8fed124d4da471ac.pdf?index=true
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_9cad11d112db46c0b54e875127f28d66.pdf?index=true
    • https://s3.amazonaws.com/dazemi/begipopajexezoman.pdf
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_be04e4b547224c5b89d031144c7c96e0.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_36e5aebfb64b40168cbf44ed48fd9c4b.pdf?index=true
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_459c86491f2a43fc9c6fd7e5f2f077c9.pdf?index=true
    • https://s3.amazonaws.com/paropabaru/80199917232.pdf
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_5b4156586a6c4cf1aa8ac4015c1ed409.pdf?index=true
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_fa86fe98c8ae4c0ea8039e5ddd7967b5.pdf?index=true
    • https://s3.amazonaws.com/minabiwa/48396142954.pdf
    • http://dakamonegip.rf.gd/lp_caput_succedaneum.pdf
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_417e7e853eb041dcb04ce0b473072c8f.pdf?index=true
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_8f81e6204bd64b3baf19dba8181d4c34.pdf?index=true
    • http://busugotuwege.epizy.com/nordictrack_1500_commercial_treadmill_disassembly.pdf
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_cba29ff60d9b42488283130f1c35eaed.pdf?index=true
    • https://s3.amazonaws.com/mutirexa/folly_beach_washout_surf_report.pdf
    • https://9f2a6cc1-6e15-4467-beaa-57274ca996ed.filesusr.com/ugd/78f4c3_ee842b36bf5244bd94adf3d05b9f9906.pdf?index=true
    • http://zetaginapuvube.rf.gd/gedojikuwigipe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07d.bin
1f134435b8df46684708981a9efb5117358507589572b7c581f27904b3e9de01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 5424 bytes
font_01_sfnt_off00010306.bin
edbdf0b6ee1dcee8333b6cbb01f041fdda1510a3d77edf13c3d3eda6ec89b385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 11728 bytes

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