Malicious PDF — malware analysis report

Static analysis result for SHA-256 917ca5a2fed7a47d…

MALICIOUS

PDF

74.5 KB Created: 2021-03-11 07:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ff03a6346dcc577ac694bb13c23a0b80 SHA-1: e0048a04b8047a5cc27d97a904329c9be547146a SHA-256: 917ca5a2fed7a47dbf8a1bb366d377c49aaba1dbfb05fe7d842db21edd5f910d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs points to an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=words+for+pink PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372371/normal_603d09d03c6b2.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/iishf7B/chatham_emergency_squad_snow_village.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/maven_tutorial_udemy.pdfIn PDF document text
    • http://barbanapoli.moscow/jekipezuropatojelevosathnutw.pdfIn PDF document text
    • http://icily.xyz/wajulunavepojudexutizivlkvkz.pdfIn PDF document text
    • http://mizifasurogik.mywebcommunity.org/boundaries_for_your_soul.pdfIn PDF document text
    • http://alphabitx.com/reddy_heater_55_spark_plug5i3cs.pdfIn PDF document text
    • http://voiprormul.xyz/arabella_pro_medium_font_free8m44v.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/hajeSvo/ielts_band_calculator.pdfIn PDF document text
    • http://casser.xyz/mawoledadiwulomitutapukibxuy54.pdfIn PDF document text
    • http://7lessons.space/soccer_training_tips_for_5_year_oldsiex2o.pdfIn PDF document text
    • http://static-get.top/lista_de_verbos_irregulares_en_ingles_y_espaolpfyhp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_6029ccfc39000.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/gatimeno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b9e563-827e-424d-9aca-5009fa811cf9/competency_based_interview_questions_with_answers_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c362ec-5ecf-492b-8b43-f1aae960d2e6/9010767931.pdfIn PDF document text
    • http://watusatuvor.myartsonline.com/dojoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f117b3-95eb-4403-8d9b-cf63abcacc38/what_is_the_role_of_media_politics_and_religion_to_terrorism.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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 4872 bytes
SHA-256: e375ee4e713cb63bacd7a409a94d989c91ca40f6252c2f69d8ba650f53d1573a
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 11040 bytes
SHA-256: 1569b31f7ce87ed5f0c398378c15b6f1666e8f24e45cda26fd0395b002a79d7e

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