Malicious PDF — malware analysis report

Static analysis result for SHA-256 3797fe61f4bcbc84…

MALICIOUS

PDF

74.0 KB Created: 2021-03-30 22:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6354795a211af7d5840474a24d018f8 SHA-1: 05b018d2fc4f417f28bafc45f205c291fdf38247 SHA-256: 3797fe61f4bcbc84baaf82ff0dd5288c47e1ebbb1ee01794ed7b4cdfc2fdbd78
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=6.0+powerstroke+oil+cooler+housing+leak
    • http://afracheat1.xyz/wedomubevavagomisamivebzhm.pdf
    • http://stankoff.org/a_first_course_in_differential_equations_with_modeling_applications_11th1ieqf.pdf
    • http://jilekuxajosozul.iblogger.org/votizumadifogumapogolaxos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lupuvogotog/honeywell_thermostat_not_working_on_auto.pdf
    • http://dereduvate.epizy.com/30159451706.pdf
    • http://dagilupakov.rf.gd/terror_in_the_mind_of_god_free.pdf
    • http://nanizezuzodujo.epizy.com/biochemical_tests_for_staphylococcus_aureus.pdf
    • https://s3.amazonaws.com/jijumupade/equifax_free_trial_credit_report.pdf
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_77cd50edfae5406e9f5d2e752f3671a2.pdf?index=true
    • http://tugoxejemikoze.epizy.com/45307635987.pdf
    • http://jidowadosul.epizy.com/b._ed_exam_form.pdf
    • http://gewofudi.rf.gd/pitch_anything_oren_klaff_summary.pdf
    • http://polezupi.rf.gd/convert_to_word_adobe_xi.pdf
    • https://uploads.strikinglycdn.com/files/0e56470b-5b4b-478a-96d7-7b4acaa4d5fe/60720413706.pdf
    • https://uploads.strikinglycdn.com/files/aca2a8fc-b9c1-4c18-824f-c84b09363882/sobet.pdf
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_5aa2d0e6675e432b9f8f4d02f5e4e78d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ef80506a-9882-4fec-8d1e-79a6031c8e36/mazijupojewofa.pdf
    • https://s3.amazonaws.com/tozaduliwubega/business_catalogue_design_templates.pdf
    • 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_off0000e1a7.bin
fc54d6e240f5b61955c519dcf4e9f4c045e54900dd37c0e191ecf596c2839dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 5584 bytes
font_01_sfnt_off0000f4bd.bin
f241c0e4ad97f7be675885dbf70a2887385d856681c30ef5cf648122bb63d415		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 10932 bytes

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