Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c67d572595bcf92…

MALICIOUS

PDF

66.0 KB Created: 2021-03-09 07:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9326bbb8e142429aa849fa6034899a91 SHA-1: 5f626469d1e31520b7e061df294923f8ed4fbb69 SHA-256: 5c67d572595bcf92b21abfa96e2b8da3bbbe9dba1bcaa11edb36a361a58fb8fa
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the document's structure and embedded URLs suggest it's designed to trick users into visiting harmful 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=can+u+use+ps3+motion+controller+on+ps4 In PDF document text
    • https://cdn.sqhk.co/porosobof/lhejINO/gold_rush_3d_guides.pdfIn PDF document text
    • http://everydayy.fun/spreadsheet_program_for_raspberry_pip4voi.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/cUQzMji/carrom_board_game_download_apkpure.pdfIn PDF document text
    • http://remont-kholodilnikov.website/bofipilnqauf.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/1EJAif1/jisoju.pdfIn PDF document text
    • http://datingsexchat.site/65656620193y4k6s.pdfIn PDF document text
    • http://grantmedica.ru/vokijojaribenesononimonzd.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/jh52uhj/44023382752.pdfIn PDF document text
    • http://vofovadero.22web.org/94419768668.pdfIn PDF document text
    • http://ledy66.net/52635556102uz9x2.pdfIn PDF document text
    • http://kiwirixup.22web.org/iso_iec_27001_requirements.pdfIn PDF document text
    • http://hh666o.site/70711703742tqaf4.pdfIn PDF document text
    • http://setofexperience.site/pasevoxrkhs1.pdfIn PDF document text
    • http://hotita.fun/84477027827916a0.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/3jhD4jh/zunuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/mokopizel/eMIhiia/xadotefeb.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/haheRgi/t_mobile_tuesday_burger_king_impossible_burger.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/iihghaV/meme_and_vine_soundboard_gold.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pazixurofuni.epizy.com/xujatidijezaju.pdfIn PDF document text
    • http://xoxemofunox.epizy.com/hodder_education_igcse_biology_workbook_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC683 5236 bytes
SHA-256: 679a5798307b940f06fd5f472f0c440d660e0f9949eff3884a82fc560905b681
font_01_sfnt_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 10116 bytes
SHA-256: 4911dc2705e655f7b531e21d1b1288fd0d146dc681cf525363b2ed63ee0a52b0

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