Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acca88860e09a57…

MALICIOUS

PDF

75.1 KB Created: 2021-03-28 23:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58a87af146fa524065aaaa021c649073 SHA-1: 04d90253e33c339f23afb4f858b9b274e2a09666 SHA-256: 3acca88860e09a57b01a18760dfeb1016fa43399343a8e69f636c7450d69e91c
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=scottish+championship+league+form+table
    • http://neletaparufo.scienceontheweb.net/vomokitekuni.pdf
    • http://xtina.online/a_short_guide_to_writing_about_film_9th_edition_freejoe1n.pdf
    • http://sunakijabe.sportsontheweb.net/relataxasu.pdf
    • http://kvadro63.ru/best_online_dnd_map_makerwkz10.pdf
    • http://kinoxca.xyz/sogutaduboliwedegusaxtzgk.pdf
    • http://wixujikubipom.mygamesonline.org/cae_speaking_part_1.pdf
    • http://vijexibat.mywebcommunity.org/41810600449.pdf
    • http://baboguzaxeleju.mypressonline.com/exercices_corrigs_maths_brevet_des_collges.pdf
    • http://gekenig.mywebcommunity.org/kirimixasobafumizib.pdf
    • http://navalny.design/is_there_an_app_for_samsung_blu_ray_remote1qywg.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://dizurexemubegog.mygamesonline.org/heath_zenith_motion_sensor_light_wont_turn_off.pdf
    • http://instapriz365.site/65316972453vwrhh.pdf
    • http://outputqwvk.space/tulja_bhavani_marathi_song2txx2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_45f9735d5de84e67a21d4ca9e5e5f171.pdf?index=true
    • http://seroritubofa.atwebpages.com/enlaces_quimicos_del_agua.pdf
    • http://bivojeda.atwebpages.com/5_ejemplos_ejercicios_de_trigonometria_resueltos_bachillerato.pdf
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_a4a376a6004644c9a48121fbc7178b84.pdf?index=true
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_6c0e98faaf134b07a5b682e805dd6137.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_0060e4619ff24a52a1f467c6f5422667.pdf?index=true
    • http://rivetibixonapaz.myartsonline.com/analisis_marginal_definicion.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_off0000e54b.bin
726736767f207ef845705cf23d3d2d8873b6abd3eeff3d4c5cdeed5f628a9487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 5672 bytes
font_01_sfnt_off0000f866.bin
178140501cfd5323e13b9f52cd3dba6f996ca5e4819462717b2da2b690deea2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 10888 bytes

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