Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb70ae9f83e6a77…

MALICIOUS

PDF

62.8 KB Created: 2021-02-24 00:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 716281af6611826ef813f4eee1136b1c SHA-1: 703b51494a77d1f5a8247478e8be84febcda41ef SHA-256: 1bb70ae9f83e6a778cb492a9312d172f889dfc7f27dca2e7ff66dde664772c04
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with a primary one leading to a suspicious domain that appears to be a redirector. The document body, though heavily obfuscated, suggests a lure related to mental health assessments, likely to trick users into visiting 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://jottigo.ru/strik?utm_term=what+should+be+included+in+a+mental+health+assessment PDF link annotation
    • https://cdn.sqhk.co/zamepeja/fnMTdha/bosapirada.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/vowedomofalebipowo.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/o3heOMv/mamubekolapov.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/makizupebikupipilexo.pdfIn PDF document text
    • http://prognoz-football.club/auditoria_financiera_boliviap2dzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_601c97a1d483a.pdfIn PDF document text
    • http://doxotuzen.iblogger.org/85867271017.pdfIn PDF document text
    • http://peregukejipesa.iblogger.org/present_simple_tense_worksheet_for_grade_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_5fe70912e58a3.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/icIgjjh/gotaregusiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473322/normal_60038939dea51.pdfIn PDF document text
    • http://storezone.info/fundamentals_of_thermal_fluid_sciences_4th_edition_solutionsri96k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476140/normal_5fdf95bd1a9a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nivawuxiki.rf.gd/visiziju.pdfIn PDF document text
    • http://mokuzamiwebifet.epizy.com/grammar_worksheets_on_comparative_and_superlative_adjectives.pdfIn PDF document text
    • http://dofomexikokubeb.epizy.com/bible_cebuano_free.pdfIn PDF document text
    • http://fozajekipijijax.epizy.com/63461528660.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_off0000bacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACB 5236 bytes
SHA-256: bc75f623e62ff91076f9b99a19dfcf7685feca0375ac61ce0ec031fdc71ed2b0
font_01_sfnt_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 9888 bytes
SHA-256: d0f135826b6613c9c8bfca053c79f20f3804d57115481b9dcbe15600da418205

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