Malicious PDF — malware analysis report

Static analysis result for SHA-256 d403a6b4ac6c4284…

MALICIOUS

PDF

72.2 KB Created: 2021-01-30 19:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 15600103b799b5592a43a3ebca0a4e09 SHA-1: 157317f64b0435b0be99cc9f1a8e9c45a2100c02 SHA-256: d403a6b4ac6c4284006092adab8d6c7df475a37c678de94c25f82a2572ac491a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to the malicious URL. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

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/123?utm_term=we+the+kings+check+yes+juliet+girl In PDF document text
    • https://cdn.sqhk.co/tigixexaxi/htjghiW/hill_climb_racing_2_cheats.pdfIn PDF document text
    • http://jojalipubawil.22web.org/gadgil_report_on_kerala.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/seravidozusivirebebe.pdfIn PDF document text
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/fumuked.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadumiza/gicJha4/pixel_car_racer_hack_app_ios.pdfIn PDF document text
    • http://beweroxaku.66ghz.com/mivabewufesiduj.pdfIn PDF document text
    • http://duvazejezirofid.22web.org/lil_kesh_water_bottle_mp4.pdfIn PDF document text
    • https://mikuzowadakan.weebly.com/uploads/1/3/1/3/131383480/1426456.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/jbhhgd3/12434635700.pdfIn PDF document text
    • http://risiwivozival.iblogger.org/connected_no_internet_hotspot_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/jcjeGUi/redcon1_gym_jobs.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/wefurimu.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/ygciihe/windows_server_device_manager_command_line.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wodasakuzetu.rf.gd/95763542010.pdfIn PDF document text
    • http://vepilezora.epizy.com/sosus.pdfIn PDF document text
    • http://nuwowafel.rf.gd/kaposi_varicelliform_eruption_wiki.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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 5104 bytes
SHA-256: a7ea8473b3ed44a5078c8734db938a013177481f11e42121be92b86512a97af6
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 11212 bytes
SHA-256: 2a43fe306c58a945c557e54497bcf4586f6f78cdc3ba2b457655e9fa487b49bc

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