Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5289af6040ae2c2…

MALICIOUS

PDF

82.1 KB Created: 2021-02-28 06:26:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a831064aa5a88f6bfb9a9b113665e0f4 SHA-1: 45432a730012e24b3640657812b357dd5987961a SHA-256: b5289af6040ae2c2cf0b62356746528dbb7b88bc009349198e3f0fafa07a8508
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to 'pelibifir.ru', which is likely used to redirect users to malicious content. The PDF structure and embedded links suggest a phishing or malware distribution attempt, possibly leveraging a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=el+se%25C3%25B1or+de+las+moscas+libro+completo PDF link annotation
    • https://cdn.sqhk.co/zijigemeworu/Ihdhejg/lurodezij.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/zLjh9ig/yalla_ludo_mod_apk_1._1._8._3.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/FhblZhb/45317468609.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/lLYjd7F/ballpoint_pen_ink_replacement.pdfIn PDF document text
    • http://gagerovovus.22web.org/actual_vs_forecast_excel_template.pdfIn PDF document text
    • http://wopivobozas.66ghz.com/gentleman_s_guide_knife_fighting.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/how_much_is_a_mahindra_tractor.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/geiGOgc/80985389406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://matufuw.rf.gd/88489812753.pdfIn PDF document text
    • http://togewogovimome.epizy.com/15876108796.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/70785984677.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/nivebudozagekowuf.pdfIn PDF document text
    • http://tetalog.epizy.com/resumen_del_hombre_ms_rico_de_babilonia_por_captulos.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/mikevadanuxuwugawedurepap.pdfIn PDF document text
    • http://badunedotefewep.rf.gd/sensory_evaluation_analogies_worksheet_answers.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_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 5528 bytes
SHA-256: bec24dea2478d77380ae7fff3d2e522d17303feeaba37c185e4c76a054107bb5
font_01_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 11268 bytes
SHA-256: 18d4d8faac94d20a1f66b865212cc8fe5348685479bddbc72784c812a054ffb2

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