Malicious PDF — malware analysis report

Static analysis result for SHA-256 729c8a7bd18ce330…

MALICIOUS

PDF

76.6 KB Created: 2021-02-20 14:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a5a0618f8585f5bf68b88aa0321de405 SHA-1: 4122e1d62fc4bf6bd3f73f140c37cf9275ee368d SHA-256: 729c8a7bd18ce3305618c5ceb4fd281aaeeface4ba15725cb666bb9fbd2a5b23
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting it is designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=riders+of+the+purple+sage+movie+trailer PDF link annotation
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/zatuvewaje-lojaxina.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/Zlkhhgc/41715534360.pdfIn PDF document text
    • http://namixojebeku.iblogger.org/sociology_class_11_ncert_book.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/TCCheih/easy_chewy_ginger_cookies_recipe.pdfIn PDF document text
    • http://znakomstva69.space/angularjs_date_filter_format3b0ux.pdfIn PDF document text
    • http://rusidaf.22web.org/dailymotion_movies_free.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/zegawepores_vedigakubo_degufem.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/lagog-xunegasamerenof-divufuxoxepupat-jiriw.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/4018977.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/803755072907c61k.pdfIn PDF document text
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/vevelejudadan.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jgwdKhi/etude_house_lemon_sheet_mask_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medojowibapij.epizy.com/41665307060.pdfIn PDF document text
    • http://tupaguwojisese.rf.gd/edit_files_free_software.pdfIn PDF document text
    • http://vaguwiraji.rf.gd/magazine_design_template_for_microsoft_word.pdfIn PDF document text
    • http://jipobemimojogot.rf.gd/adblock_plus_per_opera.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_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 5520 bytes
SHA-256: 829e864388b83ed9360de514d7115faee41218162e3c6b11d410a62de16f1b02
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 11196 bytes
SHA-256: 121eb7b421a9cff51b1d8c68badd286e1f8c4376fecb54697370c53ea677c856

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