Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f9e6cf4e4e7878…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 19:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1856767e52c85632b8346c19d3449b6e SHA-1: 79b0249fc60aa5f922f43826acf483a5d6b14dc2 SHA-256: c1f9e6cf4e4e7878a79d72da772ad33dad90f034a7b28e5f3dacd5083faf6a6f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain 'baarspo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=rhyming+words+list+a+to+z PDF link annotation
    • http://leninuludobodu.mygamesonline.org/52285350943.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/data_analytics_tools_free_download.pdfIn PDF document text
    • http://fegalaro.iblogger.org/vampire_diaries_season_8_episode_1_trailer.pdfIn PDF document text
    • http://jimefat.22web.org/19952586750.pdfIn PDF document text
    • http://doporujela.iblogger.org/how_long_can_a_stray_cat_live.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/28491185685.pdfIn PDF document text
    • http://waxusumuguk.epizy.com/xavunumatutuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7291b04e-7cb6-4517-a9a3-c739ad219f4e/71913920419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6704f57c-35be-43cb-b598-4c59b8bb14e7/9908999451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5333d9-d1ff-475e-81b3-057794ff7998/how_to_draw_easy_stitch_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9dc7ed5-d481-46da-aa15-ddb14e62535a/timex_t121s_alarm_clock.pdfIn PDF document text
    • http://pudugivifo.myartsonline.com/optional_attendance_form_tdsb_2020.pdfIn PDF document text
    • http://ledufowi.myartsonline.com/what_is_custom_number_format_in_excel.pdfIn PDF document text
    • http://zenutetuzobo.epizy.com/business_policy_and_strategy_free.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/cg_song_dj_2019_video.pdfIn PDF document text
    • http://gopaxojiximupa.epizy.com/xifowikin.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/fifobirikenobarabumutib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c34c1b-32e5-4bf6-baad-8b0b897b57f0/will_ps4_gold_headset_work_on_ps5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dcbdab0-c385-413a-a8b7-c7c978fb4328/98868752496.pdfIn PDF document text
    • http://judixipe.epizy.com/pirates_of_the_caribbean_song_piano.pdfIn PDF document text
    • http://wajiletum.epizy.com/89614574353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479472aa-1b33-4c79-81d1-4a14b6a2bd3d/what_to_eat_on_a_no_wheat_diet.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_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 5488 bytes
SHA-256: a1abd2bc81470eca5e4abb709b0423b82907274ddf8c3c1d9c4f434b4be7942b
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 11040 bytes
SHA-256: 18d9049911e38c6899eec2fa48c72bc2990d06304ef6d5097d1432a922ade776

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