Malicious PDF — malware analysis report

Static analysis result for SHA-256 b832805166233d98…

MALICIOUS

PDF

67.7 KB Created: 2021-03-22 18:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d2d19099c957faf1c59cb5c60392aeef SHA-1: f8022d8a26e13ab033c746979d1cdab7706d71f4 SHA-256: b832805166233d98135e45fb1f9f91b0a151acf6c387bfa9462419527a7f3184
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to staff training records, which is then used to host numerous links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/123?utm_term=template+for+staff+training+record In PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/vekapenisujipawagoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/j58arhj/coachideas_basketball_playbook_coaches.pdfIn PDF document text
    • https://sozuxope.weebly.com/uploads/1/3/4/8/134873608/xotovimud_xapazesegukox_lonabinolo.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/afgjhcI/t-_mobile_money_withdrawal_limit.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/2610100.pdfIn PDF document text
    • http://tebivumiwutuf.iblogger.org/31328222979.pdfIn PDF document text
    • https://wofudanizosaxig.weebly.com/uploads/1/3/1/6/131637209/b860080213d0b5.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/6520045.pdfIn PDF document text
    • https://cdn.sqhk.co/marelagixe/ilAhbMh/dasivafibuterenida.pdfIn PDF document text
    • http://jofijuke.22web.org/communications_and_information_technology_meaning_in_english.pdfIn PDF document text
    • http://vakexuk.22web.org/cisco_e2500_management_mode_firmware_upgrade.pdfIn PDF document text
    • http://safagiko.iblogger.org/sun_and_planet_gear.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_b4e375ad2d1443fc8cbeb74ac338d27a.pdf?index=trueIn PDF document text
    • http://sosozodazu.epizy.com/high_school_biology_textbook_free.pdfIn PDF document text
    • http://dopisudul.epizy.com/43628995576.pdfIn PDF document text
    • http://konomugafal.epizy.com/how_much_water_to_add_to_cook_rice_in_pressure_cooker.pdfIn PDF document text
    • http://nafivinada.rf.gd/border_video_song_bestwap.pdfIn PDF document text
    • http://gutazajegexu.rf.gd/calculus_notes_ktu.pdfIn PDF document text
    • http://gagokirabi.rf.gd/findings_and_recommendations_internship_report.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_596a6dfd7cfa4efdb70a0e726cd2c7ec.pdf?index=trueIn PDF document text
    • http://tawexega.epizy.com/awards_and_honours_current_affairs.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_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 5424 bytes
SHA-256: 848aeeb26cdc699a1d33055717fc9c23b5947cb01379b19cf9393621dd9c923b
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 10180 bytes
SHA-256: 95e72df2f5a6030b6acf0f8800f0aa993f3885e0f8e4d2381988fe29862714a7

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