Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1650420d788e3b…

MALICIOUS

PDF

82.0 KB Created: 2021-02-25 06:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5bdc5b333bf9d5491a1a5553e925264e SHA-1: f963201ea4bd3d88c35aa8714fc2b662e46771c3 SHA-256: ab1650420d788e3bfccc5ffbe67eab4dcfc16f490d06f6ed0d3d3ee96e91ce22
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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/wix?keyword=pathfinder+rpg+ultimate+magic+pdf In PDF document text
    • http://gabubixaj.22web.org/how_to_export_blender_textures.pdfIn PDF document text
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/benafox-xeladeni-liworov-sirutema.pdfIn PDF document text
    • http://6gusevshop.website/sections_of_cgst_act_20175w6pt.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/e3a6323071d1.pdfIn PDF document text
    • http://on-arenas.com/kung_fury_movie_castmcrpe.pdfIn PDF document text
    • http://pobexugapojajiz.iblogger.org/70016262943.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/01bff.pdfIn PDF document text
    • http://mepanawabopod.22web.org/compositions_of_transformations_worksheet_answers.pdfIn PDF document text
    • http://yewes.fun/poulan_pro_chainsaw_parts_diagram_pp5020av8cz4y.pdfIn PDF document text
    • http://copyright-rules-help.com/punjab_carrom_championship_2018vg7di.pdfIn PDF document text
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/popemasimajiwul.pdfIn PDF document text
    • http://rukakev.iblogger.org/isc2_sscp_study_guide.pdfIn PDF document text
    • http://xivoxuvawet.iblogger.org/east_asian_korean_drama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rixexoto.rf.gd/julazasolomosan.pdfIn PDF document text
    • http://migegavirunafo.rf.gd/purunaparikagabamur.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/ffxiv_collectables_guide.pdfIn PDF document text
    • http://xufenazaliwe.epizy.com/cessna_172_maintenance_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/juzugisupib.pdfIn PDF document text
    • http://tepokubomime.rf.gd/45991733777.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 5164 bytes
SHA-256: 316d0c25f8f3084ace844d9b3e1408ae338b6193b0f77eb6eaa74e41e8b44716
font_01_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 11700 bytes
SHA-256: 4b04bcef5c1d6111122784d55b3b5830c06f6b977d3b8c7fddf1f257d82da254
font_02_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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