Malicious PDF — malware analysis report

Static analysis result for SHA-256 a481cccdb66b3650…

MALICIOUS

PDF

89.9 KB Created: 2021-03-15 00:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 84fb0a71f221443934ed956224de8238 SHA-1: 09f720f644473f2f27aa860718acf8f6e4bdd41d SHA-256: a481cccdb66b3650d3e17d01380a83e351fd7f195fc784c04984db482990a26a
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=sqlite+database++for+windows+10 PDF link annotation
    • https://cdn.sqhk.co/wejawujagi/WFnwgfd/guided_meditation_for_deep_sleep_and_relaxation.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/how_to_use_blender_for_roblox_gfx.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/jfaJidS/cake_makers_near_me_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/8iW3Bd3/go_fish_poke_bar_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/fQwShej/jirunukijojerisozovusidu.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/ichInii/new_york_company_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/nisifowisom/X5fXgjY/cambridge_young_learners_english_starters_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/cwhye9l/hair_cutting_hair_clipper_prank_app.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/tumexevitizad.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/cSgdFoK/dawipu.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/Sjehjgf/xakazasukilovajoxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dewenulemugu.epizy.com/listado_de_precios_aduana_cuba.pdfIn PDF document text
    • http://zasufogokalo.rf.gd/roomba_960_vs_980.pdfIn PDF document text
    • http://funakadoni.rf.gd/75276776956.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/sondico_junior_goalkeeper_gloves_size_guide.pdfIn PDF document text
    • http://nolepukopele.epizy.com/98879820088.pdfIn PDF document text
    • http://zorarizasodefa.epizy.com/a_million_reasons_piano_sheet_music.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/bodmas_sums.pdfIn PDF document text
    • http://podadoperis.rf.gd/zalirilisur.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 5344 bytes
SHA-256: 9ee0902e35b9955ba10e8b785fa2f2aaae38c941c17ec515d159af7d06a1e283
font_01_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 11580 bytes
SHA-256: 820b82b82a326033397acb024044e98ba5e5ffab08e8daaeafccac7a271b15e3
font_02_sfnt_off0001363d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363D 16352 bytes
SHA-256: 867fd276a12397c4e9cf6579dce5e07e5ba80c6769d60c08053fe2abc7b8f701
font_03_sfnt_off00014bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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