Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0840ef0410e928b…

MALICIOUS

PDF

79.4 KB Created: 2021-04-01 15:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6580810faabe36014028bbefbc80eb64 SHA-1: e2aa197e265b942838adf5f1b1fa6bd9f494f95e SHA-256: a0840ef0410e928b8a8c96e8a17a22fcd206181ea4b8798f544173ec629c4e14
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded links, with a primary link pointing to 'https://bologen.ru/wix?keyword=gta+v+apk+indir', suggesting a lure for downloading an application. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of external links and high detection scores strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wix?keyword=gta+v+apk+indir
    • https://static.s123-cdn-static.com/uploads/4420432/normal_5ff459da4fe95.pdf
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/4397464.pdf
    • http://jekeluxuto.mywebcommunity.org/xuligar.pdf
    • http://kigadotezolesun.mypressonline.com/performance_measurement_with_fuzzy_data_envelopment_analysis.pdf
    • http://begimewabifax.getenjoyment.net/resumen_del_libro_secreto_1910.pdf
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/walopaterenufi-verul.pdf
    • https://fejegexe.weebly.com/uploads/1/3/4/6/134617501/5026550.pdf
    • https://jerijumewatopod.weebly.com/uploads/1/3/5/3/135330781/88bd286101.pdf
    • http://xatovapotogu.mywebcommunity.org/karapoxawemazesi.pdf
    • https://wovenatoz.weebly.com/uploads/1/3/1/4/131454427/rolorat.pdf
    • http://pakaxofuj.sportsontheweb.net/20723699518.pdf
    • http://refazali.mygamesonline.org/budobolisa.pdf
    • http://kulanefimolon.mypressonline.com/malayalam_bible_stories_for_kids.pdf
    • https://cdn-cms.f-static.net/uploads/4391317/normal_600c529a90466.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://muliwavanebebo.onlinewebshop.net/vejosov.pdf
    • https://s3.amazonaws.com/mipeboro/best_chess_trainer_app_android.pdf
    • https://uploads.strikinglycdn.com/files/375aa401-41fc-47ad-802f-90099d54a235/rorinekedunenegixafawison.pdf
    • https://uploads.strikinglycdn.com/files/51fbf221-c6a4-4d37-8989-7e6b841975e4/descargar_musica_antony_santo_mix.pdf
    • https://uploads.strikinglycdn.com/files/141315e7-278b-409d-b2a4-d3dd2f909cbd/metal_gear_solid_1_remake_ps4_release_date.pdf
    • https://s3.amazonaws.com/wewuxuviwar/36002514353.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/xizusodukodimiluxo.pdf
    • https://s3.amazonaws.com/tanikanaw/22676760179.pdf
    • https://uploads.strikinglycdn.com/files/45f4bb91-072b-4baa-9a0f-846f5cdbedef/dadabo.pdf
    • https://s3.amazonaws.com/xonaxevetaf/residential_lease_agreement_format_in_tamil.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_off0000f84c.bin
8029280d025b68f0d33871c2714e5283ccbea8a1a4c3d62cded6f7e6e72406d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 4900 bytes
font_01_sfnt_off00010913.bin
7592dceac01be76e2bf7073408a433cc4db7197e908bb32a4dc71f181923fddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 12484 bytes

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