Malicious PDF — malware analysis report

Static analysis result for SHA-256 146b6d440f590ded…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 13:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8343b35357d98b799a4e4daed3961107 SHA-1: a4b495452bdc8042894fbec19b2fce2246b8c82c SHA-256: 146b6d440f590dede35c58b753d4ea10ab72a783ad3562eddf32f5d29d094bf2
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a phishing or malware distribution scheme. The document body, though partially corrupted, contains keywords related to application forms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/award?keyword=ekurhuleni+bursary+application+form+2020+pdf PDF link annotation
    • http://nizavevorupuj.mywebcommunity.org/barreras_de_la_comunicacion_fisicas.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/nivozelinazolofarenuzezu.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/hsLigdZ/24758786603.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/70404910096.pdfIn PDF document text
    • http://upgrade4me.com/speculation_and_vacancy_tax_declaration_form0fivg.pdfIn PDF document text
    • https://cdn.sqhk.co/gananotez/dia7jCF/plague_inc_full_apk_2018_hack.pdfIn PDF document text
    • http://stav-games.ru/why_does_my_smoke_alarm_blink_greeng9qqj.pdfIn PDF document text
    • http://euroshopme.site/what_is_river_flows_in_you_aboutuxpb1.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/icvigcx/free_drum_kits_garageband_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/eopSijS/world_war_ii_movies_list.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/accu-chek_performa_e9_error_code.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/tipos_de_armas_nucleares_en_la_actualidad.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/which_personality_type_are_you_most_compatible_with.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/yaskawa_a1000_manual_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwametin/LFifbhg/pamawiguzolitipugimo.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/ansi_relay_codes.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/on_being_17_bright_and_unable_to_read.pdfIn PDF document text
    • http://loveworld.club/psalm_23_nkjv_images0plla.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/albeniz_cordoba_guitar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f269dd-b1a5-4ce6-830f-15edcb315f5a/excel_vba_get_value_cell_named_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1aa0099-40c9-4705-89b7-ee57fcfdf2d2/bedolelesop.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/91784786690.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/why_does_my_compressor_not_build_up_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546dbd24-c61e-474e-95dc-612e73e6f51e/48409459783.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_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 5932 bytes
SHA-256: 8c5ec3f66a97ab663e6530f40a15a68b95f8b26677c3cbaede3b1d2d97aa5473
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 11124 bytes
SHA-256: b5cb3f6d5936c500313b212045d7761720b8b9f3062d47d5098b44412fa3dd0a

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