Malicious PDF — malware analysis report

Static analysis result for SHA-256 661df78452676a59…

MALICIOUS

PDF

81.4 KB Created: 2021-03-03 08:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4db4a08db6f1fc093b4905d6ae57207b SHA-1: 2bd4b8c75ce43fd7eef54a0d0f2a48fdbfd62bca SHA-256: 661df78452676a59cdf6b2b9faa6aea13e5b370832dda1d538ef1d1be6a15551
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=list+of+marvel+movies+in+order+by+date PDF link annotation
    • https://cdn.sqhk.co/kobewudojuvo/eaxhhif/tevovebanajesadizan.pdfIn PDF document text
    • http://rokonedewok.22web.org/lipifabiwijani.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/auriculares_inalambricos_para_androidqc0sc.pdfIn PDF document text
    • http://lefuduzitenazig.22web.org/jonofebozefijawetoruw.pdfIn PDF document text
    • http://kidepokapila.22web.org/14704070891.pdfIn PDF document text
    • http://chelamela.org/quadratic_equation_completing_the_square_worksheetkhc4z.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/2idihia/84547318326.pdfIn PDF document text
    • http://viriruxik.22web.org/how_to_reset_radio_on_2011_jeep_grand_cherokee.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/lhb9sNP/23807141346.pdfIn PDF document text
    • http://salet.store/quiz_score_sheet_templatezkmlw.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/gdggKed/pakigo.pdfIn PDF document text
    • http://circus.market/m_audio_fasttrack_pro_manualtv3bl.pdfIn PDF document text
    • http://alex-chekalev.com/dipuritofozisinijelanog0v6f.pdfIn PDF document text
    • http://rgtuitp.ru/cissp_cbk_reference_fifth_editionyk3l2.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/L4Rifgh/86567550553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokutamewa.rf.gd/anjali_cbi_songs_telugu.pdfIn PDF document text
    • http://tezebidurob.epizy.com/talugagudixojopivikipip.pdfIn PDF document text
    • http://kidaxuv.epizy.com/bootstrap_contact_form_generator.pdfIn PDF document text
    • http://safodur.epizy.com/mac_cheat_sheet.pdfIn PDF document text
    • http://bitinorakinin.epizy.com/how_to_turn_off_auxiliary_heat_on_trane_thermostat.pdfIn PDF document text
    • http://zitupelu.epizy.com/thinking_mathematically_mymathlab_access_code.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 5296 bytes
SHA-256: 85bb71016b98839368b36ac3c01f4dc2f90dafc61c8d6996e3ac5ac780d3b2a5
font_01_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 10936 bytes
SHA-256: 32510d6c9d1f6f605e3f2272622f70b336bd7d9b2364f9ba65121a7ad19cce44

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