Malicious PDF — malware analysis report

Static analysis result for SHA-256 c825300683250042…

MALICIOUS

PDF

80.7 KB Created: 2021-03-01 18:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6cfb8cf996a887b305200401f9dbf552 SHA-1: 419833cb75ac714d59bcab179394c4e1df6774d7 SHA-256: c8253006832500427372f31ac7df149f4d660a5147417b7a1b6bfcdc9fc2473e
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host a large number of links on potentially untrustworthy domains.

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=what+is+the+theme+of+the+story+a+bad+case+of+stripes PDF link annotation
    • http://rimka.xyz/gebusegefy0ykl.pdfIn PDF document text
    • http://nudistoff.club/the_count_of_monte_cristo_musical_soundtrackax6sl.pdfIn PDF document text
    • https://sirewuri.weebly.com/uploads/1/3/5/2/135298631/5913170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5fcc45f64a087.pdfIn PDF document text
    • http://aov.one/jitezozerafogalazijegazerwvp6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_600c99575e509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_6031b4a8ccd77.pdfIn PDF document text
    • https://webimilosajepi.weebly.com/uploads/1/3/4/8/134859137/6609479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483336/normal_5fdd76ac49515.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/122da17d9ac9b1a.pdfIn PDF document text
    • http://repair-kompov.ru/how_to_open_lexus_door_with_keyltgt7.pdfIn PDF document text
    • http://resimpub.com/wef_world_competitiveness_report_2018a8wnl.pdfIn PDF document text
    • http://maturibcgj.space/mosubozjml6c.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/vusuveguwa.pdfIn PDF document text
    • http://amin-ukraine.net/97915639155utfhg.pdfIn PDF document text
    • http://pubgucbayim.com/apollo_graphql_schema_transforms2zag1.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/what_is_an_intercessor_prayer_warrior.pdfIn PDF document text
    • http://tublitalia.fun/the_chronicles_of_narnia_prince_caspian_full_movie_in_hindi_download_filmywapyehdw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilepobafomunow.atwebpages.com/panasonic_kx-tgc220e_not_ringing.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/what_is_better_a_single_stage_or_two_stage_snow_blower.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_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 5616 bytes
SHA-256: 3fd8bb7ba8db1c6af4baf927bb89fe152e2b511294c92d7b956e6e5b429a1d8d
font_01_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 10832 bytes
SHA-256: c6838139f60f8e70cd8348e3fb26b31cd01281e39962b05bfc3ef87e7591b784

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