Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a0841e134a8dd3…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 16:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b2f794f8b38274c91073283b2149438f SHA-1: b871322f0b29dfc33f4e0678ba409563d4dcf95c SHA-256: 17a0841e134a8dd335b3da8be63be0774d29514a8ac4aee4908a9e3df4f67eda
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, many of which are invisible and lead to suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads or visiting malicious sites. The document body, though heavily obfuscated, appears to be a lure for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://maypoin.ru/wix?keyword=american+flag+worksheet PDF link annotation
    • http://securitycheckingbrowservkcom.xyz/warhammer_40k_codex_8th_edition_downloadrwx0h.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/eijhghc/50696532485.pdfIn PDF document text
    • http://converstarget.ru/private_browser_pro_apkpure1rr7g.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/ver_pelcula_completa_en_espaol_latino_el_dador_de_recuerdoslrm8h.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/xitemenixomexogewukr38n.pdfIn PDF document text
    • http://businesslinecenter.com/how_much_do_beginner_freelance_writers_makebrjtd.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/fPwhj8E/merge_tower_defense_mod_apk.pdfIn PDF document text
    • http://future-techno.ru/how_much_does_a_tracfone_cost_at_walmartfrhdm.pdfIn PDF document text
    • https://cdn.sqhk.co/dawezizupata/7pgcsKF/i_am_warrior_song.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/iafsgi0/91891051826.pdfIn PDF document text
    • http://kabefuwo.22web.org/78004339456.pdfIn PDF document text
    • https://cdn.sqhk.co/nonebizi/Kw6Fjh3/nozejane.pdfIn PDF document text
    • http://effektzhizni.ru/mewipizinuwukumiwiwiwoso4jwi1.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/ljgPhdM/gilujenuxutuzagivo.pdfIn PDF document text
    • http://chtotakoevuxom.biz/best_interior_decorating_apps_for_ipaduh233.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/WggMNji/84087117166.pdfIn PDF document text
    • https://cdn.sqhk.co/jikowuzu/geqyhaM/82890551095.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejitepirisobi.epizy.com/9003580432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859acf89-0316-4b75-8564-a1a22d126fd0/jumolapigubebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067f7447-4e67-43d6-b286-0a5fa633438d/bowigeru.pdfIn PDF document text
    • http://ritarejameja.epizy.com/fokawadozujavukumapon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddf1e2d-d93a-49e5-94a6-83bc3191b3df/what_is_meant_by_psychoanalysis.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_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 5440 bytes
SHA-256: fcc0107920cb3aabf9c32994f7f3aff37ad2eb9359acfe361548c0dae52d3838
font_01_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 10972 bytes
SHA-256: c12c121378989cfadd6c2a99fba130f2a4e8a58c41b652549ecb1440646b88b5

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