Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4692c3dd46e6f0…

MALICIOUS

PDF

65.9 KB Created: 2021-03-23 15:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2a6b42121995ba805018da9c460e10f9 SHA-1: b23ebf1dfd891b025abd349980eabd2ae7cedba8 SHA-256: fd4692c3dd46e6f06b02bc23ebfabb66f431a3023c5f646c9abb4b70de9e0173
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to 'https://pelibifir.ru/123?utm_term=beretta+service+manual', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting malicious intent. Although no scripts were extracted, the presence of external links and the ML classifier's high confidence score point towards a malicious document, likely delivered as a spearphishing attachment.

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://pelibifir.ru/123?utm_term=beretta+service+manual PDF link annotation
    • https://cdn.sqhk.co/sozivowemin/PDaShhi/dead_rain_new_zombie_virus_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/46hbhds/red_lobster_lunch_menu_nutrition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fd8b9bc9fa78.pdfIn PDF document text
    • https://cdn.sqhk.co/xixofivib/ha1mOgf/defuse_the_math_bomb_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/dghgehd/titan_quest_quests_rewards.pdfIn PDF document text
    • https://cdn.sqhk.co/fidumugovoz/fgejcSn/noregixojafujutige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_5fe9ebaa983b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tesoxukezeziles.epizy.com/dillon_650_for_sale_uk.pdfIn PDF document text
    • http://nojudadosuzaxi.rf.gd/oxford_latin_course_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8780bf6-7a0a-498d-947f-1fbb131f9f75/freelance_graphic_design_jobs_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888dc673-7824-4133-a5d5-04a3fe19d21e/how_old_do_you_need_to_be_to_get_your_drivers_license_in_arkansas.pdfIn PDF document text
    • http://mavoweba.epizy.com/aadukalam_songs_free_masstamilan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec78c11-cadf-473a-ba98-70c9f43c9d3f/nituvusuz.pdfIn PDF document text
    • http://kukejisagev.epizy.com/46137913901.pdfIn PDF document text
    • http://zogaxemajov.epizy.com/monterey_county_sheriff_police_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba7b03f-a125-4157-b39b-6a39c118d110/ipod_shuffle_1st_generation_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de327585-1434-4b34-a4e1-87b196175c76/a_christmas_carol_2020_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f64cc5-44bf-4ae9-9511-6f016ca418e7/23802420185.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_off0000c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 5052 bytes
SHA-256: f1638a05e8b4a7964615c7141f6f5915e6e4b65a0924cc476a3a0248c283930d
font_01_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 10252 bytes
SHA-256: 9252f4686c3d15676f40f534db4e84622e444b9dd53747c3b1d4d09ddd80530b

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