Malicious PDF — malware analysis report

Static analysis result for SHA-256 84584f73b7930ef2…

MALICIOUS

PDF

101.4 KB Created: 2021-05-10 23:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6869e5a1d57943e03f3985017b521c1 SHA-1: dc62e66147ff19f06e272671647f071c74d7749a SHA-256: 84584f73b7930ef29ad541085a91c90bf2a439fda0e01023c615666027ee06db
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=is+there+a+sheriff+of+nottingham
    • https://cdn.sqhk.co/botonerepap/yg2ZFjc/lewuvofam.pdf
    • http://hotita.space/class_template_d_d_3._5l7mm4.pdf
    • https://cdn.sqhk.co/tidilotofuka/f6Ujhgf/kizojexikawiluvixiveve.pdf
    • http://samyog.ru/what_is_my_postal_zip_code_philippines_wikipedia78h7j.pdf
    • https://cdn.sqhk.co/velabolo/f1jaPjV/monerijanixe.pdf
    • http://bibuzikufaje.mygamesonline.org/antifungal_agents_mechanisms_of_action.pdf
    • https://cdn.sqhk.co/noxivudeva/hdgjDgc/bedupasupirugomaduvi.pdf
    • http://curvepreloved.com/hidden_objects_3d_diorama_puzzlesbmmdm.pdf
    • http://mostovaya.pro/308061784995vdyr.pdf
    • https://cdn.sqhk.co/lukedivibeb/jfbgfgh/piano_dance_beat.pdf
    • http://menbp.online/the_dark_tower_movie_series8vath.pdf
    • https://cdn.sqhk.co/numobelez/WghjLia/vuxopasedoxejuf.pdf
    • https://cdn.sqhk.co/nomazotesi/oigFRge/24056550268.pdf
    • https://cdn.sqhk.co/gizukakom/LFjajjL/37116191785.pdf
    • http://rijebipimaba.getenjoyment.net/74626655613.pdf
    • http://ceter.xyz/maytag_gemini_electric_double_oven_control_board0nnm2.pdf
    • http://lnstagramverifiedsbadgesforms.com/que_es_el_estado_de_derecho_peruanoo7a4g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_07e494b210b74969ab33f6d8dcbda06c.pdf?index=true
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_154c00d9211f46f486fc686ba06e49f5.pdf?index=true
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_419c975899f84ab08ac887c2245bdea2.pdf?index=true
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_51f02468ae0647c7b4c4687c23b84d0a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001420f.bin
9795b5af66d2ff2cd1c1f82eaab766c11b5865ef0f0b1c322ca4355f7bc2e05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 4872 bytes
font_01_sfnt_off00015267.bin
afd141520892eff26a15830166e843aeeb50473478d1606dad98c88950cc92d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15267 11652 bytes
font_02_sfnt_off00017a21.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A21 4324 bytes

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