Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42018ff9f24cc9b…

MALICIOUS

PDF

102.6 KB Created: 2021-02-19 00:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7e82eecc78f6de1378073e1fdbd8738d SHA-1: 52ce2a659be4ae67cbccce693680e78da325ba65 SHA-256: c42018ff9f24cc9bd46e039463e22f55ec72fe0a7c97f22e0d30209ac4096413
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

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://jacksth.ru/strik?utm_term=vox+tonelab+st+manual+espa%25C3%25B1ol PDF link annotation
    • https://kazimiposaduvab.weebly.com/uploads/1/3/1/1/131163956/0b4daf9dbce.pdfIn PDF document text
    • http://wedejopejujotu.iblogger.org/fegaf.pdfIn PDF document text
    • http://apeech.ru/gokonujawosekx4rbk.pdfIn PDF document text
    • https://juzemadarerux.weebly.com/uploads/1/3/1/4/131437885/dezoxopezas.pdfIn PDF document text
    • http://tendernes.ru/vuzukesurarekufuwotazoxif5n118.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/zukudatito.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/9267761.pdfIn PDF document text
    • http://vutatux.22web.org/houston_texans_injury_report_week_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_600c8a76a9144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_602196131bf50.pdfIn PDF document text
    • http://qqkaxes.xyz/formule_semi_dveloppe_de_l_anhydride_thanoiquehjmyc.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/dFYif3i/happy_glass_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kutogudofi/aCfigWo/nasty_gal_free_shipping_code_june_2020.pdfIn PDF document text
    • http://pisodanijuke.iblogger.org/boxing_star_gym_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/hdMjfge/video_editor_app_free_download_for_windows_10.pdfIn PDF document text
    • http://tobufasir.iblogger.org/47467326212.pdfIn PDF document text
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/1742296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_6010882322d21.pdfIn PDF document text
    • http://alsamcctv.com/57826772304mkr9x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazafowunop.epizy.com/gogimugex.pdfIn PDF document text
    • http://wajiletum.epizy.com/street_fighter_2_movie_free.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_off000155a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A1 5256 bytes
SHA-256: ee82379b436832280f23fd869cf1f8a5bd036b6d8b63c487640163c9c131ce63
font_01_sfnt_off00016731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16731 10556 bytes
SHA-256: 1ea00edbadf323ab77fb1a95d1df391c112c78bbf8421ae8934c0458c590b3b5

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