Malicious PDF — malware analysis report

Static analysis result for SHA-256 523236fab1f16133…

MALICIOUS

PDF

71.3 KB Created: 2021-02-17 11:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3edef97446dbff8200507355040a1c52 SHA-1: b79b8cf57a1139ee2a68712eb9ede09b126ee35d SHA-256: 523236fab1f16133cdedaa3d067e2a4804458be2db512008986381bf191245a8
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://druttle.ru/wix?keyword=ccnp+route+official+cert+guide+pdf PDF link annotation
    • http://tk-pobeda.site/76263419673q9kzp.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/JXiaFYZ/space_traders_frontiers_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/qdbHigm/jexonid.pdfIn PDF document text
    • http://podipotekoi.ru/killer_keos_skimpy_cbbe_v2-v3_armor_replacer_ssefxsr6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_601f434bca5e1.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/icngihe/pozeji.pdfIn PDF document text
    • http://reetodo.online/51133996349avbe2.pdfIn PDF document text
    • http://itali-big.space/nozunetizogirahpcbw.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/hck6Jgd/pro_pinball_fantastic_journey_no_cd.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/ggihj5y/photo_collage_studio_online.pdfIn PDF document text
    • http://requiremcgood.com/hyperion_launcher_pro_apk_v54kils5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/whatsapp_messenger_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/jekugesa.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/mapbox_gl_styles.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/applebee_s_full_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/attorney_engagement_letter_template.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 5048 bytes
SHA-256: b56a1a0431ab6750645ecb3ab67171211e837f48bb926fa2daaf60b9fcd0d79d
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 10552 bytes
SHA-256: e24dc3f8da0c9a6c519eb41f385625dd0ab36429cd85eadd61e290e7e671318b

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