Malicious PDF — malware analysis report

Static analysis result for SHA-256 63556ce1286692ce…

MALICIOUS

PDF

72.7 KB Created: 2021-02-27 06:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cfcb6b4ddbc98cb2097f9b599ed4f9ed SHA-1: cfed531719e56cbb6e73ca9ad1a7d2b5cb17a01c SHA-256: 63556ce1286692cebcefe75b5471ac96592b78bb96b85daaa201ffcd01f6e641
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link farm attack pattern. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it was generated programmatically to host these links.

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
  • 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://nipisod.ru/strik?utm_term=adjectives+to+describe+rainsford PDF link annotation
    • http://matrixbicycles.com/tv_guide_uk_freesatxy6g6.pdfIn PDF document text
    • http://belldiscount.ru/oracle_sql_insert_escape_single_quotehgpwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465000/normal_6016de04e1870.pdfIn PDF document text
    • http://file-id.ru/amona_tete_mabo_free3kod0.pdfIn PDF document text
    • http://jushq.club/which_chainsaw_is_better_echo_or_husqvarna04vnt.pdfIn PDF document text
    • http://reduslimitalia.site/decimal_places_worksheets_ks2ibf5y.pdfIn PDF document text
    • http://namelesssouth.xyz/39942492662evekd.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/46948336203.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/aqualink_rs4_troubleshooting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fd6831ebbd8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_602f0141e5b2d.pdfIn PDF document text
    • http://kungfumalibu.com/pedanu28thm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fc6a5844b28c.pdfIn PDF document text
    • http://leadtop.co/92963814917rnxh7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_602c92d3d00c2.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/jitewuronuwojekiluxuwaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medexode.atwebpages.com/plan_de_estudios_2011_primaria_primer_grado_matematicas.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/how_to_write_a_pitch_deck_for_a_tv_show.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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 5248 bytes
SHA-256: 52d5888ed4401537fd918549e2a80e54bc3302b80ecbacfc55fe6eaf3630f41e
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 10584 bytes
SHA-256: 51957764e3ab019fcaca7ec346fd94c75aa1a53f8073767410dd9a68301648a7

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