Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ef21a6911f05ee…

MALICIOUS

PDF

81.3 KB Created: 2021-03-26 09:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c020198287c4a41d7264a299101e3e52 SHA-1: 9fd6146a5140e8df2a010315d6bcee683b9a1d32 SHA-256: f4ef21a6911f05ee47a194d54f9cdafd2f7aa2ca4af8ec0f9a2c4d0159af7436
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as a resource for game mods. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=gta+v+mod+apk+mobile
    • https://cdn.sqhk.co/komajekolino/aai3jgW/98727791662.pdf
    • http://japarof.mywebcommunity.org/quarterly_report.pdf
    • http://kuxuvajivor.iblogger.org/high_graphics_android_action_games_offline.pdf
    • http://winopufivugum.22web.org/construo_de_tanques_para_piscicultura.pdf
    • https://cdn.sqhk.co/duporetixi/VQgjnbi/ecological_succession_lab_graph_answers.pdf
    • http://gekifek.scienceontheweb.net/pimuto.pdf
    • https://cdn.sqhk.co/kimorotadopo/jCLihif/world_hockey_championship_2019_tv_schedule.pdf
    • https://cdn.sqhk.co/buzivafulet/jjqigEW/febuvamo.pdf
    • https://cdn.sqhk.co/tuvuderasaza/Dgj2hcy/fall_guys_the_catches_ultimate_knockout_split_screen.pdf
    • https://cdn.sqhk.co/bedazume/Chd3A7l/auto_reply_comment_facebook_page_free.pdf
    • http://kejurudoji.medianewsonline.com/71625966090.pdf
    • http://wewofif.scienceontheweb.net/shanti_narayan_differential_calculus_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tufitijinexu/tubiben.pdf
    • http://tamufigavoxi.rf.gd/snow_white_princess.pdf
    • https://s3.amazonaws.com/satuja/marshall_mcluhan_understanding_media_the_extensions_of_man_summary.pdf
    • https://s3.amazonaws.com/nojemi/nerijolanuzadarutivok.pdf
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_c5f5b78bea9941ad8ecbe0f77368ac77.pdf?index=true
    • https://s3.amazonaws.com/loranoduzuja/gomosepik.pdf
    • https://s3.amazonaws.com/dezajok/lcd_2004a_i2c_datasheet.pdf
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_384c504ee7a444319b65659e4391913b.pdf?index=true
    • 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_off0000fd88.bin
14a76cb500c4a34b90d46da542275fb05b915a4441fceeb2f0eb8a03db09128a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 5128 bytes
font_01_sfnt_off00010ef7.bin
82aaa41da5ee66b16f03577714d29c0855b38ca0537e7a6bc6c68e0292fa1c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 12116 bytes

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