Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b42854e56fb44c3…

MALICIOUS

PDF

78.0 KB Created: 2021-03-13 15:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 73716d13721e3e66137dee005320076c SHA-1: 5cb4f0b4a574883e7fee0b7faa800d9ffdc8d8c4 SHA-256: 0b42854e56fb44c3f7edb029258996f844c1ff1c75e09559e5d26fc215f39065
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/award?keyword=livro+ortopedia+e+traumatologia+pdf PDF link annotation
    • http://welitizenowem.mywebcommunity.org/down_and_out_in_paris_and_london_audiobook.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/7ab08120f04f.pdfIn PDF document text
    • https://mijibetifud.weebly.com/uploads/1/3/4/6/134653630/2646003.pdfIn PDF document text
    • https://tugokuwotim.weebly.com/uploads/1/3/1/3/131379049/buwariketigovurenafu.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/govevokatepinakuve.pdfIn PDF document text
    • http://jumbochecker.com/jaselin3xp7k.pdfIn PDF document text
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/wigobesaposa.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/vuvugabukupu.pdfIn PDF document text
    • https://detubutil.weebly.com/uploads/1/3/5/3/135348338/soleturum_soruvizito_mogodelagi.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/xiwameziwolopalarejusa.pdfIn PDF document text
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/edfd6.pdfIn PDF document text
    • http://hdsamara.ru/how_to_cook_a_pot_roast_in_a_bella_pressure_cookern5tvm.pdfIn PDF document text
    • https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/1391424.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/nagaxekibidiporodu.pdfIn PDF document text
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/kukejalikujeni.pdfIn PDF document text
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/lawumuta.pdfIn PDF document text
    • http://cyberghost.store/wow_cataclysm_engineering_leveling_guide_1-_525rbr9n.pdfIn PDF document text
    • http://begemotiks.space/airline_booking_system_gabriel_user_s_manual86s12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejegaba.atwebpages.com/55878869987.pdfIn PDF document text
    • http://ginisanekuxowo.epizy.com/descargar_geekbench_4_apk.pdfIn PDF document text
    • http://pekodumale.rf.gd/hp_officejet_6500a_plus_parts_manual.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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 5184 bytes
SHA-256: 98085d956317cefef8517c89f379cbbd3fd93c807a9878945df6542fa5a0d0d2
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 15196 bytes
SHA-256: ce818e0d21c9558ee10f1b689ee67c9945016854b742c9aa45c63321292f35ab