Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42acc50ad79cbfc…

MALICIOUS

PDF

90.5 KB Created: 2021-02-17 15:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3227393e1f127918e55e87273e555941 SHA-1: 5c5f7bae40dbeb1cf3a74f1696ee0df5d8beb4bd SHA-256: f42acc50ad79cbfc2c47b9faf08f0a6bb70dbd859d66997e299aefbc40a428f1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on directing users to 'jottigo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/123?utm_term=how+to+become+a+caregiver+for+someone+on+disability PDF link annotation
    • https://taralibupub.weebly.com/uploads/1/3/4/3/134372711/penapuzuworavazize.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/f57670a6eb.pdfIn PDF document text
    • http://vijufik.iblogger.org/wexatagafob.pdfIn PDF document text
    • http://naturwows.space/answer_to_a_problem_synonym5c1mr.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/army_adp_study_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/ehihdtf/pakuwenotupimunidiru.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/UkjKhed/73132561879.pdfIn PDF document text
    • http://brandframeb.com/64424962579cx0bm.pdfIn PDF document text
    • http://momentshop.website/warhammer_soulstorm_necron_guidehmzei.pdfIn PDF document text
    • http://laulu-go.ru/tidubeg6j8a.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/1R8igdG/castle_story_roblox_good_ending.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/fabidukezoropi.pdfIn PDF document text
    • http://discount50it.pro/fijegerja4p3.pdfIn PDF document text
    • http://help-copyrighteamservice.com/85031625632ik244.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/hhjdK3y/bezaxav.pdfIn PDF document text
    • http://teachost.com/ta_notification_2020hy7d8.pdfIn PDF document text
    • https://vumetubav.weebly.com/uploads/1/3/0/7/130776444/mozopasejaduzeresup.pdfIn PDF document text
    • http://metalllift.ru/5_inch_binder_spine_template_microsoft_word670bm.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/bufipevuril/chapter_12_the_integumentary_system_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/20431766379.pdfIn PDF document text
    • http://tomoveko.epizy.com/man_body_photo.pdfIn PDF document text
    • http://tirodubixuvix.epizy.com/macromolecules_review_worksheet_for_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/minecraft_apk_aptoide_para_pc.pdfIn PDF document text
    • https://medlineplus.gov/caregivers.htmlIn 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_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 5696 bytes
SHA-256: 5062af7894c27f8391bbaeb00abd90c7b726d6fa3255578782b0ef82d10ac94e
font_01_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 10392 bytes
SHA-256: 78e7a82fa6ddad64a8cf819e0384afe5ffdd0dae12d3d17e701c8dd1e9329829

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