Malicious PDF — malware analysis report

Static analysis result for SHA-256 504fbce3481188f2…

MALICIOUS

PDF

71.6 KB Created: 2021-04-16 13:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4fb8d3f57d11fc1dbe1bb9c4ae56fcb0 SHA-1: 150ce2352b752e638bf1bed9fe29dd2f18fb6c5c SHA-256: 504fbce3481188f24b8d750b19c0d400b490640a95b3fdb4c9ebea727a6cf387
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely intended to trick users into clicking malicious links.

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 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://ponafet.ru/strik?utm_term=angle+worksheets+for+grade+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394061/normal_60550ca0544be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370275/normal_5fe169d27adf1.pdfIn PDF document text
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/kemolofevapor_juxewilipoba.pdfIn PDF document text
    • http://jujasoje.iblogger.org/30805362255.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/004ea553a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_60643878de8ec.pdfIn PDF document text
    • http://watercart.ru/jatewilaxfq5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_60427381383a6.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/pabuwafinirox_basazo.pdfIn PDF document text
    • http://gakmancreatures.ru/40878173925e4pbt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_600f4d26b89ec.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/4ghRHhL/real_football_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fokigegoma/YNTKYOs/streamlabs_chatbot_currency_setup.pdfIn PDF document text
    • http://sesulig.22web.org/51954202250.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/julawuromolal-dabeneleribibe.pdfIn PDF document text
    • https://xifupanudolegu.weebly.com/uploads/1/3/1/1/131164204/5666949.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/aggD5of/the_crossing_columbia_mo_live.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinapigakumise.epizy.com/64086778643.pdfIn PDF document text
    • http://laxizal.epizy.com/89936236447.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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 5400 bytes
SHA-256: bea320827c99fc354d55be481123e14a721b72027ee1f1eb90c99908024c6ff5
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 10580 bytes
SHA-256: 87f757d8fbfdf6a01a859b06da15034dc6ce0e345138e2794cedd7f738abc52d

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