Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b18f696c14943d4…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 15:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 596f5e4a2b1e4399a8ec272848414f5c SHA-1: d201d7d86d01eff4b2a0a694dc79e021a4bffb05 SHA-256: 0b18f696c14943d45fc6fdb1d14bd68fe011132d3ea5a72a96a5222a1ea6c64e
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating a large number of external links, suggesting a link farm designed to distribute malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF structure strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=cross+disciplinary+skills+worksheet+connection+to+fine+arts
    • https://cdn.sqhk.co/benanejufa/6hhgigf/como_jogar_goat_simulator_multiplayer_ps4.pdf
    • https://cdn.sqhk.co/dagidomu/jdgg9Bz/61127519904.pdf
    • https://cdn.sqhk.co/xamowizaso/jai1hhj/mannipaaya_word_meaning.pdf
    • https://cdn.sqhk.co/vagofedewat/kFggX5D/40988565729.pdf
    • https://cdn.sqhk.co/pajokiman/AgfU0jf/34867812916.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_d03f2be9f437405eabe419d50bc204ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/62e0739f-5f6b-4bec-a271-cb16d50a9a30/50413409378.pdf
    • https://s3.amazonaws.com/resixexi/whatsapp_app_tizen_store.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/video_er_link_app.pdf
    • https://s3.amazonaws.com/warapagefasovi/sukiripusimenilomiduwejun.pdf
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_00641ef2a9fe45cc827d4940ff5a62d0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aeab549b-f931-4075-8f9b-75af6fa43551/how_to_read_surah_al_mulk.pdf
    • https://s3.amazonaws.com/vavapekadoliti/grade_6_math_adding_fractions_worksheets.pdf
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_59d40ab50dcb4e0a8ecda12495bea2d1.pdf?index=true
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_ddb147a7c5e94068832c50e646e5a657.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_821ef2236dc74df78637bd5c45856719.pdf?index=true
    • https://s3.amazonaws.com/bulolimepol/33327762144.pdf
    • https://uploads.strikinglycdn.com/files/6499f9c1-de31-4a38-b4bb-881fa4c0e13d/2079389302.pdf
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9095d8a6465a4b4e95b2beec0721692f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e922.bin
eeaadcc0358e3cfbfd3829935bdb4cf214d9f8b32a42fa049ad394395dfd3961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 5404 bytes
font_01_sfnt_off0000fb99.bin
717509bb35a35684399dca011be04422b00fb2e3b5a919abc9b1317e9a98a924		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 10868 bytes

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