Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ce1335d825bfb8…

MALICIOUS

PDF

85.6 KB Created: 2021-03-18 18:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba0eeef1f4336cc761f2a0f6cd890979 SHA-1: 63657c855dd5fa9e53f5cca6b3d27ef3937ac346 SHA-256: a8ce1335d825bfb85b7391533d49be5f44154ee22ddc086cc329ae2e6966eae0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=how+do+you+calculate+turbine+efficiency
    • https://cdn.sqhk.co/lusesito/ha1q7hh/vaporesso_revenger_x_220w_touch_screen_vape_kit.pdf
    • http://zipezaronin.iblogger.org/boutonniere_deformity_treatment_splint.pdf
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/zuguzofujuxamu.pdf
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/pugaxaroratadat.pdf
    • http://jomokanus.22web.org/58205459994.pdf
    • https://panodetis.weebly.com/uploads/1/3/4/6/134669877/4813280.pdf
    • https://cdn.sqhk.co/dizukenepu/fggjftT/how_u_say_hi_in_japanese.pdf
    • https://cdn.sqhk.co/xefijumu/heuToyg/46745838327.pdf
    • http://baxijemapuzoxu.22web.org/amputee_definition.pdf
    • http://fubewakixodi.22web.org/68896838045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://viladanus.epizy.com/formule_excel_arrondir__la_centaine_suprieure.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/que_significa_soar_con_muchas_cucarachas_en_la_cama.pdf
    • https://s3.amazonaws.com/jawusawar/formal_dress_online_shop_indonesia.pdf
    • http://gorulilul.rf.gd/bawupubufumitejikenezexa.pdf
    • http://xifabemifuxiza.rf.gd/ms_crm_rest_builder.pdf
    • https://s3.amazonaws.com/kavugusepe/psp_games_android_dragon_ball_z.pdf
    • http://zetewesejoj.epizy.com/matthew_hussey_momentum_texts.pdf
    • https://s3.amazonaws.com/wopari/69519256357.pdf
    • http://topagujowulefe.epizy.com/zelifagaw.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae4.bin
92d2699ebfdaf9134b29588d2533408f9d09b8b30666cb0cf433723fc6fd474c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 5132 bytes
font_01_sfnt_off00010c80.bin
87767b3d530e8cf5dc76e9cca6a413b4eeab2b4b95f6c68476be05b14906d325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 11676 bytes
font_02_sfnt_off0001336e.bin
c4441e48b2f68604838bd51e3092d1355fc6ad73caca962ec91191dcf11ac5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 16224 bytes

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