Malicious PDF — malware analysis report

Static analysis result for SHA-256 778cb805aaf3f3bb…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 00:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba166cd7b3ddc3475f137cf89b88607 SHA-1: 484cf2c14b15b13726f05b687467b4ac1e6800f8 SHA-256: 778cb805aaf3f3bb09098d6f9a39c0372d8b652c44ce1c1f7db5ab272647e517
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=axiomas+de+zurique
    • http://pc-remont.website/cannery_row_book_sparknoteseqecp.pdf
    • http://christinaanddavid2019.com/original_meaning_of_pifflerhn4k.pdf
    • https://cdn.sqhk.co/busumodofu/hbhahdx/go_fish_sushi_watertown.pdf
    • https://cdn.sqhk.co/lolumebitana/jbiegiN/piupiu._io_battle_of_tanks.pdf
    • https://cdn.sqhk.co/gujowaxexag/jxjdpgc/red_ball_3_jump_for_love_mod_apk.pdf
    • http://mewudaguzexo.sportsontheweb.net/53675932350.pdf
    • https://cdn-cms.f-static.net/uploads/4483591/normal_6051c8c67900e.pdf
    • http://ita-fitness.fun/free_online_european_history_textbookrrn6y.pdf
    • https://cdn-cms.f-static.net/uploads/4405208/normal_6050d6f2e070d.pdf
    • https://static.s123-cdn-static.com/uploads/4499984/normal_6008888f13218.pdf
    • https://static.s123-cdn-static.com/uploads/4428054/normal_5fdfaaddaea61.pdf
    • https://cdn.sqhk.co/xuwolegu/y1jggf0/aflatoon_video_song_in_hd.pdf
    • http://datab.vip/commando_game_free_for_android_mobile27416.pdf
    • http://bumululoru.mywebcommunity.org/which_sump_pump_is_best.pdf
    • https://cdn.sqhk.co/ninulekuto/7hjjiii/ligukisadupivefuripunuri.pdf
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5fcc21ad6d050.pdf
    • http://naturebiolog.space/85060016440ivmui.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rowurujo.epizy.com/algebra_formula_file.pdf
    • https://s3.amazonaws.com/vufuzewasi/answer_key_2019_onam_exam_10th.pdf
    • https://s3.amazonaws.com/lanaladu/amado_mio_sheet_music.pdf
    • https://s3.amazonaws.com/vutame/23459111386.pdf
    • http://vonezilomobupir.rf.gd/xololuketoxit.pdf
    • https://s3.amazonaws.com/jaxesabi/excel_vba_copy_html_table_to_worksheet.pdf
    • http://sizemogigu.myartsonline.com/namokobibis.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eceb.bin
35ac1ba2e31242fedfb343021666969edbca3db1d910ecae5209c2e100c86d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 5172 bytes
font_01_sfnt_off0000fe70.bin
f7a5e95ab81429e746ffd7aa48fcaa55cb3ff2ee4f74889f0b35b4701573d19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 12892 bytes

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