Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6ae1ff2858ee31…

MALICIOUS

PDF

76.2 KB Created: 2021-03-22 23:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 582d2fb93a289b755e46cda2ccc208bf SHA-1: b61b2bd8a157cc7479cb5f0704b2905b9a7215b3 SHA-256: af6ae1ff2858ee319642596446e876689670f0c355aa674860982a710c17396f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ponafet.ru/award?keyword=nios+admission+form+pdf+2020 PDF link annotation
    • http://cg-designer.xyz/pokemon_games_for_android_without_emulatorcx5tw.pdfIn PDF document text
    • http://new-leggins.site/how_to_speak_english_fluently_in_10_daysh84bk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_6054961cd348b.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/DFQhbie/14461120887.pdfIn PDF document text
    • http://marketeuro.pro/157063498846wvsa.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/capital_cities_of_the_world.pdfIn PDF document text
    • http://abreudesigns.com/legend_of_korra_turf_wars_free_reads5i71.pdfIn PDF document text
    • http://znalomstvavip.site/44961072438glncx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423752/normal_5ffd47ae373b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486206/normal_5ffb343e570f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_6027a53422bec.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/LYiihgu/s_word_wallpaper_pic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fd63fcc83921.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/25966265890.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/thcjgif/grimvalor_walkthrough_forgotten_library.pdfIn PDF document text
    • https://cdn.sqhk.co/novujarogoga/hJgPahg/fivufifipiralevebeburunuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_106404a0adbf4eaa8acff8db8e01c54e.pdf?index=trueIn PDF document text
    • http://kivozusemu.atwebpages.com/verizon_motorola_mb810_sim_card_location.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/naruto_shippuden_wallpaper_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/jolly_phonics_songs_free_mp4.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_af117dbfda824fbfb095499206cced9c.pdf?index=trueIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_0e29448b13834f52817c7c02b97f1c02.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_02e7688c1e944e2faed17da868fdb01c.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_adee51cc0f924028a1a7a46754a0469c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/amazon_india_latest_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/changing_states_of_matter_worksheet_grade_6.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_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 5396 bytes
SHA-256: d8be069bdf468b2129c4fe63a49bf4efa42c3ba98dfb5acdff5804dc6f8041d8
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 10416 bytes
SHA-256: 5156e45df424c8a9e4521d493f27bacb4278eef8ccfb8d2da6d53b2832114ecb