Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac81aeb912f32dc…

MALICIOUS

PDF

97.0 KB Created: 2021-03-22 19:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8de30f29fbf54384bff0a48a9e23ec4 SHA-1: d6a0f169eb8dbe7c9bd292e52c98055450224bb6 SHA-256: cac81aeb912f32dc8fcaaeecf2209bbab26d7d28f98f7b3a614db842b8e72915
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://botokaw.ru/award?keyword=edital+policia+rodoviaria+federal+2020+pdf
    • http://ergors.space/vintage_kenmore_sewing_machine_manualudg5p.pdf
    • http://sis-paypal.com/is_samsung_galaxy_grand_prime_plus_4gt5doc.pdf
    • http://kyhni.site/afcat_2020_notificationnxbrx.pdf
    • http://tcerkovniekupola.space/dininj1w2r.pdf
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/wotuvo.pdf
    • https://cdn.sqhk.co/dodufiruw/58IAvSP/50526972851.pdf
    • http://vegifeda.mypressonline.com/libro_los_secretos_de_la_mente_millonaria_mercadolibre.pdf
    • http://new-volosi.ru/can_magic_bullet_make_smoothies1q4g7.pdf
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/4557207.pdf
    • https://zepusarogetiki.weebly.com/uploads/1/3/4/6/134687077/2272868.pdf
    • http://jakusavu.sportsontheweb.net/far_side_theme-a-month_off-the-wall_2021_day-to-day_calendar.pdf
    • https://cdn.sqhk.co/roratumopiv/jbLsEhi/ruvegalujuk.pdf
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/8551909.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pasofotamuteper.atwebpages.com/descargar_biblia_de_jerusalen_1967.pdf
    • http://biburusig.myartsonline.com/bankbazaar_credit_score_password.pdf
    • http://xidalagep.myartsonline.com/trials_of_apollo_4_review.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001341f.bin
257d2e6bfb94aabecf759d4cc0d230c50dbf15c26828c7f0548cc2df44415c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 5264 bytes
font_01_sfnt_off00014620.bin
51cf94b7d730a0a1a27692ca064758090762b9c4865ee12ca2c0c34cd75e182e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14620 15920 bytes

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