Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f03372a8f03964…

MALICIOUS

PDF

82.2 KB Created: 2021-03-06 01:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d080df436348a1dc2f8c96ecaa2c1885 SHA-1: 778074ebe0937bc0ae1717b5079c257ddde50255 SHA-256: f6f03372a8f0396497929d093d76df12b4297b7c938f68b810bcbb2510fdb4fe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'envision math 5th grade worksheets online', indicating a lure to attract users seeking educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://golowaki.ru/123?utm_term=envision+math+5th+grade+worksheets+online
    • https://buwirudoxux.weebly.com/uploads/1/3/4/5/134597973/0da0e2fc862.pdf
    • https://cdn-cms.f-static.net/uploads/4495269/normal_601218d6c8fa7.pdf
    • https://cdn.sqhk.co/jesovolavig/jgjddeP/starz_free_preview_june_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4477655/normal_5fc7fa3d059e2.pdf
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5ff4cefb13c66.pdf
    • https://cdn.sqhk.co/gikunixa/ahb6jis/89823311227.pdf
    • https://lizoxezubim.weebly.com/uploads/1/3/0/7/130776499/zolofejezamutox.pdf
    • https://cdn.sqhk.co/fimegasaz/gcgcPij/10452850399.pdf
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/2557510.pdf
    • https://cdn.sqhk.co/gukokefa/agi5ieA/1641359911.pdf
    • http://nogezat.iblogger.org/ganipuvasesekezete.pdf
    • https://cdn.sqhk.co/bitowiso/8ksCpia/vowabonikapijevoluv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vavijirodujozi.rf.gd/6001236878.pdf
    • http://mesawebibu.rf.gd/98551581761.pdf
    • http://vajitefafuxuz.epizy.com/74023108538.pdf
    • http://visowad.epizy.com/kavobalezetigu.pdf
    • https://s3.amazonaws.com/degisapemifa/bogleheads_guide_to_investing.pdf
    • https://s3.amazonaws.com/tawovojo/gozoxuja.pdf
    • http://kepipejesa.epizy.com/wow_mount_farming_guide_bfa.pdf
    • https://s3.amazonaws.com/nolarifaforuxop/solving_quadratic_inequality_worksheet.pdf
    • http://pibubirokur.rf.gd/cessation_nation_apk.pdf
    • http://jefokid.rf.gd/john_deere_310a_backhoe_for_sale.pdf
    • http://rexawisoza.epizy.com/24363766250.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65d.bin
795cd5de96a7089b4b8dae6bd51645af9682c37534a073160c63e22652f8f5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 5324 bytes
font_01_sfnt_off00010859.bin
dccb9d7bce026c9fb16f3df0f60e9b62701079158ca732bb759b79a5b5d33e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 10632 bytes
font_02_sfnt_off00012c8c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 4324 bytes

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