Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6aa5d3907c55294…

MALICIOUS

PDF

95.6 KB Created: 2021-03-30 20:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 708a68ba1479a7f61300b635cf8a855d SHA-1: 9cd0b9c0a00fcceee502160726024ad17e1352ce SHA-256: f6aa5d3907c5529418d307c360875506b79db533bcae8a518222115fc2f714b3
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL, 'https://dafemum.ru/award?keyword=cardiac+arrhythmias+book+pdf', suggests a phishing or malware distribution lure disguised as a book download. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/award?keyword=cardiac+arrhythmias+book+pdf In PDF document text
    • https://cdn.sqhk.co/siganewita/hqvqcR7/pokemon_ethan_gamer_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/eTMnjhZ/61685118497.pdfIn PDF document text
    • https://cdn.sqhk.co/lozosasuxe/je6KPp1/the_scary_teacher_granny_branny_survival_mode.pdfIn PDF document text
    • http://sberbank.link/tebopujofubagilebakuwirig3tpq.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/jcprhjh/vanguard_full_tower_tempered_glass_pc_case_sama.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/objjV2j/catbird_seat_meaning_and_sentence.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/ige3Rje/blocky_farm_tips_and_tricks.pdfIn PDF document text
    • https://cdn.sqhk.co/jegetito/ib0hfKG/3d_transform_robot_battle_live_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/ghWxidd/53013913160.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/2hiB7c8/xiaomi_yi_mini_dash_camera_arac_kameras.pdfIn PDF document text
    • http://astropsychology.website/audacity_free_windows_7_full_versionycydm.pdfIn PDF document text
    • http://thefortykuti.com/65078965201d4ruo.pdfIn PDF document text
    • http://teksol.xyz/zambia_biology_syllabusk0g2d.pdfIn PDF document text
    • http://xteenware.online/60758751326oah75.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/galinikagopit/gimekidojorabadofewasibo.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/78607328262.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/27723454952.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/pedavosadut.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/turnigy_9x_frsky_module.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/grammar_article.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/polaroid_white_rainbow_sx_70_camera_with_flash_bar.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/google_chrome_manager_plugin_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/el_alfabeto_hebreo_y_su_significado.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/nujedelivibasuluwunober.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/rogeki.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_off000133e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E2 5572 bytes
SHA-256: 8f1916622f6628c02ff324e10fb5b37849977c2055d355cada8fefebbc146cab
font_01_sfnt_off000146ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AC 11884 bytes
SHA-256: 73ff84933ff5e549f51e63211d8d2b61103a61721f18fab1f58ad598b8911bc2

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