Malicious PDF — malware analysis report

Static analysis result for SHA-256 8871721641594bbf…

MALICIOUS

PDF

77.9 KB Created: 2021-02-24 16:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5afb428eca2e78555fc3815a82d3ebf8 SHA-1: 70fb5afd2946bdce4104223644ae9cf2fc6a6ed7 SHA-256: 8871721641594bbf3cd779faac53e8a4667edc4de48c4454b5cdcab66f929b87
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs pointing to disposable domains, suggesting a phishing or scam attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious campaign designed to redirect users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=norma+iatf+16949+pdf+espa%25C3%25B1ol+gratis In PDF document text
    • http://appeal-ig.com/john_deere_gx345_parts_list43hz1.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/jiygjha/17652253808.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/51297380903.pdfIn PDF document text
    • http://agentsecure.space/break_even_analysis_noteslg35e.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/mazexojegofulu.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/lowrance_elite-7_ti2_met_active_imaging_3-in-1_transducer.pdfIn PDF document text
    • http://clientbluebadge.com/lalomodefas75c50.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/1643848.pdfIn PDF document text
    • http://stroy-level.ru/jobuwilubupitafwgd.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/67a5b2a75eeaea.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/dragon_ball_super_kakumei_manga_chapter_2evl4h.pdfIn PDF document text
    • http://vitrinachel.ru/hollywood_action_movies_free_in_tamilinht6.pdfIn PDF document text
    • http://vinnipoh.fun/the_little_icu_book_of_facts_and_formulasudfcv.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvutose/iejaQ5o/23575930029.pdfIn PDF document text
    • https://jebezefekoju.weebly.com/uploads/1/3/4/7/134737834/rebosozonaten_fozimuzin.pdfIn PDF document text
    • https://kadeniki.weebly.com/uploads/1/3/4/0/134097858/96cad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutexuvidag.myartsonline.com/is_eso_worth_it_2020.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/banosakuviporuvosujupat.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_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 5992 bytes
SHA-256: 8747d390050143f2f7c4f832f5a499018011d4cb4d929f22c0ab90f0820060dd
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 10936 bytes
SHA-256: a310f84d7be3940713d5b722b4798b76d8d15e793bc2b28c039bb6245ab37fba

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