Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3405bd5109040b…

MALICIOUS

PDF

70.1 KB Created: 2021-02-28 17:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 380f66f8ef0a68b273d364f71e91a4e7 SHA-1: 328ef72142bd14d24173307cbc53a9720771b581 SHA-256: 1e3405bd5109040bc8d8108f6898a6a293a0050bef5cdcf19f39b00cbb8fb289
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with external URIs pointing to potentially malicious domains. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware-hosting sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bologen.ru/wix?keyword=apk+dji+mavic+mini PDF link annotation
    • http://vipadobosu.iblogger.org/87620119315.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_much_do_maids_get_paid_in_the_uk.pdfIn PDF document text
    • http://centerverifybadge.com/the_story_of_my_life_casanovayh94h.pdfIn PDF document text
    • http://aycotoro6.xyz/twilight_breaking_dawn_part_2_watch_movie_onlinewkc22.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/25731389851.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/classical_guitar_hand_exercises.pdfIn PDF document text
    • http://static-start.top/how_to_do_a_finger_wave_curl3n946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nazonuretowu.epizy.com/konebima.pdfIn PDF document text
    • http://jonevojufe.rf.gd/place_value_2nd_grade_anchor_chart.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/how_to_repair_your_heart_after_smoking.pdfIn PDF document text
    • http://livigoguja.epizy.com/advanced_actionscript_3._0_design_patterns.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/sueo_de_una_noche_de_verano_ballet_teatro_tepeyac.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/where_can_i_get_osha_10_certified.pdfIn PDF document text
    • http://baponexar.epizy.com/math_aids_reflections_answer_key.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/62863108557.pdfIn PDF document text
    • http://filulakakinu.epizy.com/how_to_work_out_exact_trig_values.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_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 5104 bytes
SHA-256: 08c5a8bec23a43bc5a7d5ef09b67c7e6fe0e2bc94833d515324870b02f1ea2ed
font_01_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 10376 bytes
SHA-256: d39f08f5738fca2f5818973e87c8e53b0fb34e5232e53f7be2e46b08bb62db45

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