Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7a45ffb88f91a2…

MALICIOUS

PDF

114.6 KB Created: 2021-03-14 01:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 016002e69a284a7c1ef8f9f8663ef5c0 SHA-1: c301db3a4e653b2a1181a811d9e680497ad32521 SHA-256: fe7a45ffb88f91a2a79db1bdd2e32dd22494aa02c391240a101d8de271a155d4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL distribution are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=clockwork+orange+book+pdf PDF link annotation
    • http://kwini-fini.online/equivocate_crossword_answereblmy.pdfIn PDF document text
    • http://casser.xyz/troy_bilt_tb110_blade_sizefikzi.pdfIn PDF document text
    • http://tryraisins.club/maze_runner_trilogy_4k_blu_rayb99o0.pdfIn PDF document text
    • http://uspeh.icu/which_fictional_character_am_i_buzzfeedyyo3b.pdfIn PDF document text
    • http://myyshooop224.site/discounted_payback_period_example_problems76p13.pdfIn PDF document text
    • http://mnogoturov.com/subewigipologogifaximitipj71z.pdfIn PDF document text
    • http://wonnaturila.space/intimate_apparel_lynn_nottage9rgmv.pdfIn PDF document text
    • http://albatros-trans.ru/dell_u2415_windows_driver8zf06.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/iGhbZih/1952509141.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/jdO1jc0/party_in_the_usa_kidz_bop_lyrics.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/zaxefemebidaz/50899919849.pdfIn PDF document text
    • http://pomezup.epizy.com/jovup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41031a2e-b325-45ed-8066-9cf33a73f783/how_to_reset_wd_my_passport_ultra.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/bigozurexojaxukep.pdfIn PDF document text
    • http://puligop.epizy.com/jingle_bell_song_christmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134b325e-8295-453a-bd23-c19a7c278726/how_to_follow_paleo_diet_for_weight_loss.pdfIn PDF document text
    • http://nofadokar.rf.gd/heads_up_email_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9280d0ff-3257-46df-b6df-a1de56a0f1ae/jugedazujajisalurul.pdfIn PDF document text
    • http://lujopuz.rf.gd/hp_z420_workstation_mainboard.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/arm_assembly_language_programming_book.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/citizen_eco-drive_promaster_nighthawk_watch.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_off000181b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B6 5348 bytes
SHA-256: e98f84f98167c856eb5bd540bfcc85a1281c23b266b03c9afdf4f5b4da5897c8
font_01_sfnt_off00019406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19406 12732 bytes
SHA-256: 289be9c7a476622c203b8d55d56ee06b54646d8f5de467ca48823c05a15faed8

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