Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af2fc7c8e095131…

MALICIOUS

PDF

90.4 KB Created: 2021-06-12 11:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 871c3000ec6bfe571dca69386c1dc0e8 SHA-1: 0429dfa0c664ff237d1dfeefcd3b961037f7efc4 SHA-256: 8af2fc7c8e095131d45889c09c6c62fa075d7114afe64b0b036a3d39b9031015
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to various content, including potentially malicious ones. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://huntic.ru/pbw?utm_term=how+to+get+to+level+90+in+xenoverse+2+fast PDF link annotation
    • https://dumamigurox.weebly.com/uploads/1/3/4/3/134336195/1377696.pdfIn PDF document text
    • https://mixifotosipepe.weebly.com/uploads/1/3/4/8/134875306/3240829.pdfIn PDF document text
    • https://kufofena.weebly.com/uploads/1/3/4/5/134504524/kiwosew.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/nelibimixodamav.pdfIn PDF document text
    • https://duvutonog.weebly.com/uploads/1/3/6/0/136020002/tavavir-zimisogewidefu-dumuw-sivurun.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/6055524.pdfIn PDF document text
    • https://tilapenudulaw.weebly.com/uploads/1/3/1/6/131607943/gutiwazezit_gakapinamazefir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doxawadar.pbworks.com/f/78634672943.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/peliculas_de_accion_en_espaol_completas_gratis_2017_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c40f8d-384b-4630-b18e-5efe39b5bd37/how_to_fix_mic_turtle_beach.pdfIn PDF document text
    • http://tugovozow.pbworks.com/w/file/fetch/145092876/tor_malayalam_new_movies.pdfIn PDF document text
    • http://rajejor.pbworks.com/f/fake_transfer_receipt.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/vivitar_wireless_qi_charger_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccad391a-2e8a-4d32-85f4-df2769e69627/i_am_affirmations_bible_verses.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144423009/how_to_reset_summer_cadet_baby_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461a9724-7de1-43f3-bdda-4b88c2d9b405/ipod_nano_not_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667a0a50-a273-4b10-862a-d3982b196723/14261503273.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144790083/cinderella_story_with_pictures_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cdb6402-1629-4de6-9fab-bfab3436d8b8/whirlpool_quiet_partner_1_reset_codes.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_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 5548 bytes
SHA-256: 6258da9d8496ec4aa0d04f18ad14c64e6858e4832da67bb21463ca0340fcfc48
font_01_sfnt_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 11300 bytes
SHA-256: 2b51ffb1663030773afd9be64c7936d095eb0692d1973ba3cb9cfa0196185e07

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