Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9bc27570b04d53…

MALICIOUS

PDF

71.9 KB Created: 2021-03-31 15:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2d76d43fc0d8d132bf7723c83a2f2413 SHA-1: 831507b2d1968e7753308f07710ad197e48e579a SHA-256: bf9bc27570b04d5360203c2d869e52a758b07bf17d8da9b5ec71d383d156c3ec
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with two identified as potentially malicious or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords like 'cysa practice test pdf' which aligns with a phishing or credential harvesting lure.

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://druttle.ru/award?keyword=cysa+practice+test+pdf PDF link annotation
    • http://xedeporib.medianewsonline.com/maya_banks_breathless_trilogy.pdfIn PDF document text
    • http://igcopyrightforhelps.com/how_do_you_cook_a_ham_in_a_roaster_ovend04ai.pdfIn PDF document text
    • http://carbags.site/74972607387hvd3g.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/62059360999.pdfIn PDF document text
    • http://barashik.space/57506800568cnh9p.pdfIn PDF document text
    • http://options.expert/what_size_room_will_a_30000_btu_heater_heatuyzjk.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/4c6249f8-4c09-4592-9aca-dab79082d24f/which_bhagavad_gita_is_best_in_hindi.pdfIn PDF document text
    • https://4192d618-ecd7-4808-8485-efd4d6773ded.filesusr.com/ugd/17a5db_efef169dfe034e59a4eede15006fe6ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec92809-4414-4bf3-8362-699f35db95b9/69861538107.pdfIn PDF document text
    • http://xepuzakudera.atwebpages.com/motorola_g6_play_phone_charger.pdfIn PDF document text
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_dec7d925526e48689fe09ad9e45d6eab.pdf?index=trueIn PDF document text
    • http://lusajafimaneru.myartsonline.com/apocalypse_world_2e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c99f61-079a-4995-bd33-aa6370e3d6d2/rosuwewemitakip.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/pachinko_machine_repair_houston.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_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 5124 bytes
SHA-256: fc708250c2fe43fd1a98798adfae8ee3dddd41a1a5bbd6e27a725073f0d98bad
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10964 bytes
SHA-256: a89a513c120fd041760e3320d67279b814b2f1324e63fb98a868225b1f625c8c

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