Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca68487f0738ccf1…

MALICIOUS

PDF

82.9 KB Created: 2021-03-28 01:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4ae5ba484dc097951ddcd319ba22dd8 SHA-1: 1a5071b9471bc69e2c8380356f756a3a0bd18c79 SHA-256: ca68487f0738ccf11dae1582b513aad603810c581b2cd34c18af663be88ad595
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru', suggesting a redirection to a malicious site. The document body, though partially corrupted, contains text related to 'irregular ir verb conjugation spanish', which is likely a lure to disguise the malicious intent.

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
  • 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://nipisod.ru/strik?utm_term=irregular+ir+verb+conjugation+spanish
    • http://ighelpcenter.xyz/199719909059h4jg.pdf
    • http://cardioactiveitalia.site/66076585880xsini.pdf
    • http://shoplus.info/fajowevalowoputarepzpw.pdf
    • https://cdn.sqhk.co/noxivudeva/agfuieU/246524405.pdf
    • https://cdn.sqhk.co/vizakifito/Tgfiasa/super_ninja_steel.pdf
    • http://sodaapp.pro/total_flow_area_equation0s90v.pdf
    • http://1xbet-registrat.site/engineering_calculation_paper_templatetoiuf.pdf
    • http://repair-telefonov.ru/zopilu60pti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_47db2555a72846d0a3066d7a98bdfe2d.pdf?index=true
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_7fc990785f7a4b899b75b30480538ec0.pdf?index=true
    • https://s3.amazonaws.com/juwofuxufijup/59785391244.pdf
    • http://gadubuwarin.epizy.com/how_to_adjust_gshock_time.pdf
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_cfbb546c58ce4861b251bc61d5bf7441.pdf?index=true
    • http://ruvoluze.rf.gd/24393708159.pdf
    • https://s3.amazonaws.com/furunumaroxun/free_food_and_medicine_wild_foods.pdf
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_49a753f1392c4ce0b79d4cbcb55fcf87.pdf?index=true
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_eb9498b48d774ffc92bbb80d32bfa506.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_off00010528.bin
2ed2a38220b12252262b14c8eea42f8b19c15abfe3183c9fd6f761e39749e58b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 5408 bytes
font_01_sfnt_off00011792.bin
8752188662fb4ad433e9fd26816563f3b9d2ee1338f73b868b570beafbca6f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 12264 bytes

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