Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f8353dc995b9dc…

MALICIOUS

PDF

69.5 KB Created: 2021-02-22 00:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d99b1d75a8acc7c9e7a73f07b18f0185 SHA-1: d2fb729c1e1258bb59211d9f973f8f6934a057b0 SHA-256: e8f8353dc995b9dcaa433106580fe903eee1c02b5b7c3c3471058283ae282c24
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=what+are+strengths+and+weaknesses+of+the+articles+of+confederation PDF link annotation
    • https://cdn.sqhk.co/labifikup/giggkLw/34625289018.pdfIn PDF document text
    • http://dle-tpl.site/3567625099io0gt.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/3iagcVy/fumomatek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_601921fe61559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389805/normal_5ff1591828bdd.pdfIn PDF document text
    • http://ita-women.space/bukuxabilupafizufixotretqz.pdfIn PDF document text
    • http://vetokikiw.22web.org/75943793414.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/cwUjgig/23688562762.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/iiaFlYa/84704550430.pdfIn PDF document text
    • https://cdn.sqhk.co/vikaxokaso/QRigIRP/71365568772.pdfIn PDF document text
    • http://rukawagamijo.iblogger.org/tuvozewanok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5fc67a8cc4ffb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5ffc8a06f3f63.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/tululebavodakivemadalo0zpkj.pdfIn PDF document text
    • http://hookup666.site/programa_para_unir_gratis_en_espaol2i88f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/improvement_plus_one_2019_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/how_do_i_program_my_comcast_remote_to_control_volume.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/welding_and_fabrication_workshop_tools.pdfIn PDF document text
    • http://gefutikavuza.epizy.com/myriad_pro_regular_google_font.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/regedaxuvufo.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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 5452 bytes
SHA-256: 468727ee4b80236cee5334607f974de997d6e34757dea96b3bbef1d0183b6643
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 9748 bytes
SHA-256: 9c560c32dd5591d35ba43008ba9f7527a5b4d8743e3a26255aaa17ad25ab32c3

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