Malicious PDF — malware analysis report

Static analysis result for SHA-256 876fb6b59185eb3f…

MALICIOUS

PDF

73.6 KB Created: 2021-02-24 01:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: edb2c1ffc2727dfa81c239938952bb49 SHA-1: e79828b7db911c1680d791e4dd6dcde1fafe818b SHA-256: 876fb6b59185eb3fb19a0faf55bdb36db022fa6eaf4301a8cae9dc26f9c17108
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains keywords related to prayers and demons, which may be used as a lure to entice users to click on the malicious links.

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://jacksth.ru/strik?utm_term=john+eckhardt+prayers+that+rout+demons+and+break+curses PDF link annotation
    • https://cdn.sqhk.co/laruxibut/yic3jfT/66166810530.pdfIn PDF document text
    • http://rutomatuwusu.22web.org/skills_practice_solving_absolute_value_equations_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/Zghovgf/80370876271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_601e0a2d11b8a.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/aia2CtX/alphazero_research_paper.pdfIn PDF document text
    • http://visiwetivopewe.iblogger.org/ponasedarodokifuzovozoxaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_60219dd2ba82a.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/jjsehhc/the_archer_warrior_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/JeQhchh/evo_io_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/ihgevhe/perimeniloxova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejobewibibir.epizy.com/20206452918.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/informed_consent_survey_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/safety_data_sheet_defined.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/wpf_listbox_header_template.pdfIn PDF document text
    • http://bofiragomux.rf.gd/aneurisma_fusiforme_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/cisco_sfp-_h10gb-_cu1m_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/62831506838.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/47055008885.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/89672103731.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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 5576 bytes
SHA-256: cb5437363d44213d375250e510f920313d8a7e8570ab177b72acbc269bca1361
font_01_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 10176 bytes
SHA-256: bdb455b880777ebee2826c48283e1fdf8e8a8317da07e36d88dfebe1f1be941f

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