Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cb2840e0c0d6b3…

MALICIOUS

PDF

82.1 KB Created: 2021-02-26 22:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 71f03524cb583c7045ae00952175243c SHA-1: 607d0b1090c5c377b891f83705151133507d1e1e SHA-256: 73cb2840e0c0d6b3a9eca067609f1a7c3394e2eba43e6ab734bc3347b451b62f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure related to video game search results, designed to trick users into clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wb?keyword=which%20splinter%20cell%20game%20is%20the%20best PDF link annotation
    • https://cdn.sqhk.co/detaludolef/ijbgdhi/34441020986.pdfIn PDF document text
    • http://andyhong.blog/brain_training_games_for_adhdl5zy6.pdfIn PDF document text
    • http://chatik85939775.fun/96260271183haktw.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/gghaLhf/power_starz_ghost_and_tasha.pdfIn PDF document text
    • http://datingsexchat.site/davupepejexolijl8evk.pdfIn PDF document text
    • https://cdn.sqhk.co/lovuzegonu/ihjhgdA/sonimu.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/RFHXrUa/monkey_kung_fu.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/pub_217_maneuvering_board_manual.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/buresoxu7c2bq.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/MGNheyZ/naughty_boy_pentagon_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/bidieH5/england_championship_league_table_standing_2019_20.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/92831026052.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/d7lhj39/trash_talking_droids.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nijetazum.epizy.com/1716182131.pdfIn PDF document text
    • http://zijomofi.epizy.com/zolez.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/morixunadulisikuzo.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/crusader_kings_2_steam_reviews.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 5176 bytes
SHA-256: 056a2ef3bbccc5e2e728611ccccf6f30dbc2364ef96758a516a929afe635ec44
font_01_sfnt_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 11200 bytes
SHA-256: e324ec967e92b5080bfaa8507cebadd363bc7d7b9c82f58c5116799568df8550
font_02_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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