Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23bb2bc763f5157…

MALICIOUS

PDF

105.3 KB Created: 2021-03-20 02:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3de8620b311c01c8edb5a8ca0e7a8e1d SHA-1: 288ded0851432b769b1d62b615557db8acfd5bb4 SHA-256: f23bb2bc763f51577c5646d82eb99b99c18527fc418a3c7d7e4cca543aaceeab
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which lead to disposable hosting and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://lozipotod.ru/award?keyword=agustinos+en+la+nueva+espa%25C3%25B1a+pdf PDF link annotation
    • http://helpverifedbadges.com/fewekerukulasonixeridfix7.pdfIn PDF document text
    • http://top-salez.site/17178864894mk3p1.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/navebexefatagazejajes.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/nuzokerfetgb.pdfIn PDF document text
    • http://zivodelozino.iblogger.org/small_fry_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/f1hajji/bunny_s_world_jungle_bunny_run_2.pdfIn PDF document text
    • http://garderob-podolsk.ru/poresileraganuxavafat3p187.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/khaCykk/majukesuwudav.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/9jbbjjz/27851846284.pdfIn PDF document text
    • http://trells.space/android_16_vs_perfect_cell4j5fo.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/aAiijfD/dart_blaster_zombie_nerf_gun.pdfIn PDF document text
    • http://dawaferip.iblogger.org/27656524761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ae286571-9fb4-44de-9269-822098726fd4/7772343345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c154fb-d932-4b2b-a69f-cc1a3b6adbbf/77799514204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7d2f0b-befb-4ef0-9522-7d4451840629/who_is_natalie_biden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303ea24b-412a-43fd-9e09-2e67b1b1022e/who_is_the_minister_of_justice_jamaica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff50334b-8e2f-4471-abb1-ad6c9eed821b/komeratugupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b77cd3-e5e4-4546-b365-0a81fd0b3ac6/how_to_teach_main_idea_to_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4d83e7-76a5-4dcb-90c6-6b7285d9c54a/what_questions_to_ask_an_employer_during_a_phone_interview.pdfIn PDF document text
    • http://gibapomidumitar.rf.gd/76076186318.pdfIn PDF document text
    • http://gubazit.epizy.com/xikivotaxuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF6 5256 bytes
SHA-256: 6dbb3996569628ad60ebd781195e6a3abf5c6d315db927bc3bfe488e41e269b1
font_01_sfnt_off000160b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B3 12308 bytes
SHA-256: 498da53becfddcae8a5a195569c47cc00b83f2a578b03c84561aa34818ccd04a
font_02_sfnt_off00018804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18804 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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