Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50420b618a6b4c3…

MALICIOUS

PDF

84.3 KB Created: 2021-04-05 01:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 659bd656ba3e089bce5616698a4a30b2 SHA-1: 9b5f92f994382c496123ebe2d8e758b912f8bb8c SHA-256: c50420b618a6b4c34d4d247bf2e330dee5c5dccdf072e896561d96aa982e4c70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=bangkok+transit+map+pdf PDF link annotation
    • https://cdn.sqhk.co/nupegefozub/jePb2EI/97994310961.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/wieAgg5/metal_slug_7.pdfIn PDF document text
    • http://m-ryanaf.site/llp_bs_formatet5hi.pdfIn PDF document text
    • https://cdn.sqhk.co/kakovavop/jj8PnDm/dijizubawemamukubugiv.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/bVhcIuG/36317827013.pdfIn PDF document text
    • http://semengergel.ru/gidagitelivamokijia6xu.pdfIn PDF document text
    • http://profit-makers.club/the_perfect_stranger_book_synopsisaieid.pdfIn PDF document text
    • http://usacreditscore.info/how_to_find_standard_enthalpy_changeqa4ex.pdfIn PDF document text
    • https://cdn.sqhk.co/mafozerekat/driFmfO/world_cup_qualifiers_south_america_live_stream.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/73516631890o7uc.pdfIn PDF document text
    • http://priz24.site/dpe_applicant_copy_2019kjaab.pdfIn PDF document text
    • http://abistrans.ru/55857907577m1h93.pdfIn PDF document text
    • http://stopnutristrike.ru/descargar_survivalcraft_2_apk_gratiscac0y.pdfIn PDF document text
    • http://easterthjg.com/mr_coffee_iced_tea_maker_replacement_pitcher_3_quartol3p6.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/iffibjd/2018_can_am_defender_hd10_price.pdfIn PDF document text
    • http://bloomwithdeanna.com/how_to_update_lowrance_hds_gen_1ujzyy.pdfIn PDF document text
    • http://mmamba.ru/kusibexotorujafatuwawuto37u.pdfIn PDF document text
    • http://alisabor.design/cute_snapchat_logo_white1te2d.pdfIn PDF document text
    • https://cdn.sqhk.co/godivago/zygjigm/bollywood_new_movies_free_full_hd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woxutubutofewev.rf.gd/31479785428.pdfIn PDF document text
    • http://xufeguwopox.rf.gd/how_to_pair_jbl_eon_615_bluetooth.pdfIn PDF document text
    • http://bezepegu.epizy.com/w-_4_personal_allowances_worksheet_2019.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_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 5440 bytes
SHA-256: abd558f182cac8a541eff74309ecde360d2d056e5f853cb3f2928d7ccf6f609f
font_01_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 11300 bytes
SHA-256: 3e925a0942e0907367728d22eaa808f99ce5fc5f406eb40da5ebc8f288eb4392

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