Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2e0506a424df2f…

MALICIOUS

PDF

75.1 KB Created: 2021-05-02 14:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 01d97a0493cc854b054cacf55ba47a31 SHA-1: feb4c3115a71de5b5887fc25bcb7668dd34a183d SHA-256: 3d2e0506a424df2f6f45f60bdc063a7922061f3e50efbe3892cd8eb94b3eb453
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL leading to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Geo joke worksheets answer key'. No scripts were extracted, but the presence of multiple external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://baarspo.ru/strik?utm_term=geo+joke+worksheets+answer+key+%25231 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483331/normal_6059074d9b5b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_6022bfe6b89de.pdfIn PDF document text
    • http://xitimudajejo.mywebcommunity.org/32111901796.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/hifghPQ/download_water_park_slide._io_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/naxaroja/kieja0e/donkey_kong_arcade_rom_retropie.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/wagabemopelosif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461497/normal_5fe4b8c4112b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_60459cea78913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_6010b1a4ce461.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/gcjcuFw/bedroom_furniture_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/jhdheZm/free_business_plan_template_for_cleaning_service.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_60264d2ed8ef5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402932/normal_5ff7c8db9c6e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_6022be61b3822.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/bQhiQhe/free_joy_cross_stitch_patterns_modern.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukomakiduw.myartsonline.com/98045851470.pdfIn PDF document text
    • http://wanezezigemos.rf.gd/ratatiwelifegusomude.pdfIn PDF document text
    • http://jezawirigi.epizy.com/97596029952.pdfIn PDF document text
    • http://pegolika.rf.gd/ip_prefix_number_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d8d683-1c16-4949-970f-a16671fb77cb/5103937412.pdfIn PDF document text
    • http://venijulezazowo.rf.gd/32876787943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110295fb-9304-4d91-a331-655d3c67cd31/nozuzo.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_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 5108 bytes
SHA-256: f524d57b5705f9febd6cae4ef13751edb4053e2c2de1327620548f474207f2cb
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 11548 bytes
SHA-256: a04ce4ae78a908476509d137fbd542f665599c353a77088936a59f452c3e4818