Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c2a734c6a4f190…

MALICIOUS

PDF

74.3 KB Created: 2021-06-10 14:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05960860b195d71e4d6b53a3de8a575e SHA-1: d6b20531075ce3b6c887f23b8540dbd973067266 SHA-256: c1c2a734c6a4f1908057714b14c7e43339faf4a829e59e2fc42325fe18ada947
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites.

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://chcial.ru/pbw?utm_term=pokemon+games+for+drastic+emulator
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/wubatex.pdf
    • https://nugumogixowujo.weebly.com/uploads/1/3/1/4/131437940/8614972.pdf
    • https://fugazuxelodurip.weebly.com/uploads/1/3/4/6/134639195/dufimaka.pdf
    • https://cdn-cms.f-static.net/uploads/4461207/normal_5fd785fca3459.pdf
    • https://static.s123-cdn-static.com/uploads/4457839/normal_6004157c84ad2.pdf
    • https://xatikofaf.weebly.com/uploads/1/3/0/8/130814669/vuvusaku.pdf
    • https://cdn-cms.f-static.net/uploads/4480893/normal_60bb77b426713.pdf
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/1522338.pdf
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/9851349.pdf
    • https://cdn-cms.f-static.net/uploads/4499656/normal_60c091b356486.pdf
    • https://cdn-cms.f-static.net/uploads/4490547/normal_60bddc4b23aa4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8299e46c-44d8-4ff9-b946-570e47d1e1fd/exercises_to_improve_report_writing_skills.pdf
    • http://zusemivak.pbworks.com/f/farmakoloji_hemirelik.pdf
    • http://wemilamozede.pbworks.com/f/dls_2020_hack_apple.pdf
    • https://uploads.strikinglycdn.com/files/707f7233-39ef-428c-bfae-3910db0e0077/what_were_the_terms_of_the_treaty_of_paris_spanish_american_war.pdf
    • https://uploads.strikinglycdn.com/files/1f2a0d4c-9345-4791-8db8-99ded2879269/sylvia_plath_books_free_download.pdf
    • https://uploads.strikinglycdn.com/files/9df8a3c2-b3e9-48a0-9d89-470959ccf7a8/how_do_you_program_an_old_clicker_remote.pdf
    • http://tisowowuduwe.pbworks.com/f/xijenoj.pdf
    • https://uploads.strikinglycdn.com/files/22ff56ec-8190-4653-9fdf-2bd6a0b6e770/gebatubedominanuzafalutif.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_off0000e291.bin
adb679fb8bb6209658b88bc40a5943460ef9828b0a47d98213a82f6edf412af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 5408 bytes
font_01_sfnt_off0000f4e7.bin
4b078d4fd121f5390d7277a23c3661a867221b535e38c1ad3fb14934d371191a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 11700 bytes

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