Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43499cf89f0f5e5…

MALICIOUS

PDF

81.7 KB Created: 2021-05-10 07:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ee84cda04d4f2fae6738f3fd142f5c SHA-1: b12adb7d81748c95c87cb3fe0fe9274a4e15fa4f SHA-256: d43499cf89f0f5e5ad07df406d8292f35d725892867ebdf364b219ba848ac19f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'lozipotod.ru'. The PDF structure and the presence of embedded URLs suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=the+castle+of+otranto+analysis+chapter+1
    • https://cdn.sqhk.co/miviterul/gVWsOib/alarm_clock_app_no_sound_windows_10.pdf
    • https://cdn.sqhk.co/wozulifudon/jNIghNW/human_flow_movie_watch_online_free.pdf
    • http://fringigejy.site/gawikeneduparokuvup5yzj.pdf
    • http://sokolov.fun/spectrum_tv_app_roku_guidescbvl.pdf
    • http://voirlo.xyz/93385388270uw249.pdf
    • http://honbiz.pro/22412184225hvyaq.pdf
    • http://merishwheelrecords.com/dfl_pretest_answersalhmu.pdf
    • http://roflan.site/quimica_inorganica_gratisool49.pdf
    • http://wdd13.ru/roporimosojajujojap4bawy.pdf
    • http://thedefenseforge.com/medios_de_produccion_estructura_economicaqw9sv.pdf
    • http://dmdmassage.com/hamlet_movie_2009_online_freepyj0h.pdf
    • https://cdn.sqhk.co/jugemito/9gdKgiP/lanolomosigenatezu.pdf
    • http://astropsychology.website/1433392484xsq9l.pdf
    • https://cdn.sqhk.co/sutekepape/0piaihl/interdepartmental_mail_template.pdf
    • http://zabavnyi-slon.ru/is_gdp_per_capita_the_same_as_average_incomehn7f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/863a1c17-e8b5-4ac4-ab63-92825f033586/the_sneetches_and_other_stories_read_aloud.pdf
    • https://uploads.strikinglycdn.com/files/2b300ff4-42d4-4b41-869f-3f0738276562/pidikoxewowog.pdf
    • https://s3.amazonaws.com/zowejunef/john_lewis_egyptian_cotton_single_fitted_sheet.pdf
    • https://uploads.strikinglycdn.com/files/93ca98ba-ff74-4bdd-8a84-3016af0f2b02/how_to_register_divx_vod_on_lg_tv.pdf
    • https://s3.amazonaws.com/zolerazowubow/71726424635.pdf
    • https://s3.amazonaws.com/tiluwisulepam/rojoviloberuwodivegisizu.pdf
    • https://s3.amazonaws.com/jivamubug/fowixanuvobatigipo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff5e.bin
a7769545810fbd2c94031ef85fe749a85f8de9797b7f3b8aa2045cbc77eee1ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 5208 bytes
font_01_sfnt_off0001111f.bin
92f7267f41a1e4d7f7786fcaa208e07e44caaf5c1dabf4ff02ec19dbef6b8218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 11576 bytes

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