Malicious PDF — malware analysis report

Static analysis result for SHA-256 1367dfaecced586a…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 21:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1160cf82048ca6e72846e3fa3dd27f63 SHA-1: 4a07dfd505b5f944a075ee6e72dd53d8d3448bb6 SHA-256: 1367dfaecced586a1cc852f2a3cd1b234eea11e8725af039c3b338117961a5ad
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily garbled, contains text related to 'cursos de ingles en houston' and wkhtmltopdf, suggesting a lure to a phishing or malware distribution site.

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://vilenefex.ru/strik?utm_term=cursos+de+ingles+en+houston PDF link annotation
    • http://khareedforosh.com/what_is_a_good_name_for_a_grey_horsezb3tn.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/iehcChe/msi_afterburner_overclocking_scanner.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/ohhibhh/76681248756.pdfIn PDF document text
    • http://streichpack.online/gerrard_touching_this_is_anfield_signgy77e.pdfIn PDF document text
    • http://medway24.com/71400005223o1l0m.pdfIn PDF document text
    • http://allerop.xyz/xulozida2x8xv.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/NeSAyjh/tasedeg.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/gjdieKG/35674601110.pdfIn PDF document text
    • http://fc-aromat.ru/itil_v3_processesac0k9.pdfIn PDF document text
    • http://lnstagramoriginal.com/forensic_science_textbookgyj01.pdfIn PDF document text
    • http://rm-swis-mine.com/750068074939xxbs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/is_it_ok_to_have_dental_work_before_a_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/pufewixapuwexafabazed.pdfIn PDF document text
    • http://suvapik.epizy.com/active_and_passive_voice_worksheet_grade_8.pdfIn PDF document text
    • http://zinabukupomij.rf.gd/university_of_california_berkeley_business_analytics.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_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 4780 bytes
SHA-256: d25a8186349e783a348f06c87b6f2c0f43c8c9db193056f1eb8d11fc66396914
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 13064 bytes
SHA-256: e0d70e8c06f29532a7db0bbc4e28a4aa00acd80960cf3521f829500372b1f4c9

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