Malicious PDF — malware analysis report

Static analysis result for SHA-256 9660614391c896b9…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 21:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ac17c3d6ac13d797fcb2553465c55118 SHA-1: 0ba2c5a2f9ec1ddc17047ce507575b7fae43dcce SHA-256: 9660614391c896b937af59d1ff5cac922eb23234fb0bc0bd6d13eef492b79f76
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on potentially untrustworthy domains.

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://fokemale.ru/award?keyword=marchantia+thallus+pdf PDF link annotation
    • https://cdn.sqhk.co/kobewudojuvo/khcsjic/hungry_shark_evolution_game.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/45970321166.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/que_es_el_deporte_recreativo_en_educacin_fsica.pdfIn PDF document text
    • https://cdn.sqhk.co/romafime/yibx5Vq/63119859353.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/cgiifuM/lebara_sim_card_not_working_denmark.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/vupununonewovusezu.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/administracion_de_medicamentos_via_intramuscular_fundamento.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/FTgiELC/jasper_save_report_java_code.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/hcOigQK/siwap.pdfIn PDF document text
    • http://wosozage.mypressonline.com/par_quoi_remplacer_la_mascarpone_dans_une_chantilly.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/google_maps_timeline_missing.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_7ae67c900ec54c96b0331910c2e18647.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_25972613e3d545ec8ecf4ad477aeedad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68096a51-29d3-4ee3-840e-ec87bc81ef74/54589970628.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_c019949898e84707bfa0f250145d6645.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af7b9b6-d102-45ca-9fa7-44c21bf579a5/hamlet_act_4_scene_2_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/82052094732.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_e6deeacfa9d44214aabc9ce9ed863e89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8acc007e-1214-4f1d-a332-18fcf2c92529/star_wars_rpg_edge_of_the_empire.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_3a2fd8c74ef74a65b06856151aff19e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/357c7b11-6723-47be-ab54-36b193e32477/sijulafisuvale.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_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 5248 bytes
SHA-256: 2cec0445e50bd5004531e78f334203af734327f4b7393f5ff7497e06a9297b92
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 10620 bytes
SHA-256: 20c12e952fa1a46afb25928e86b11482a14db4be95a809e08b3052248ed459a2

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