Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64c25b5aba9d66b…

MALICIOUS

PDF

75.7 KB Created: 2021-04-11 17:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a7a4b7d0dc534b850efcb5027d285d23 SHA-1: df5adb27081ea217450f12aa4873ec4a99d2a8e7 SHA-256: f64c25b5aba9d66bf031e6e01e91fbdc2b58f8b96c751f2756d4ae56aafeef44
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, with one prominent URL pointing to a suspicious domain, likely serving as a lure for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=all+the+characters+in+the+sign+of+four PDF link annotation
    • https://vakitisize.weebly.com/uploads/1/3/4/0/134017930/sokavitorabojeva.pdfIn PDF document text
    • https://dubilovatigalis.weebly.com/uploads/1/3/4/7/134701517/nomov-pinukoritibo-jetuxuz-jibepuwi.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/duzokilo_kexegibazotusa_kelegezisutiw_vakotavetezunaz.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/iyRA8L1/rijagowazemifevad.pdfIn PDF document text
    • https://cdn.sqhk.co/vukobefebu/igkjfBQ/security_access_control_procedure.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/ketuvoxapewe.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/sbi_internet_banking_profile_password_reset_form.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://idealica-ordina.site/zezuzavikowarafikibumue7m85.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/hbNmQ5C/63435542210.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/tofegasixixiz_jenedi.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/cAijgij/burger_king_cleveland_ohio.pdfIn PDF document text
    • http://medgaj.com/gunanenejemikekusapunamizxqoa.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/hcPELih/77366360267.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/makixibawumebol/bowowixavakur.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/zivunap.pdfIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/lowanimok.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/ssc_cgl_quantitative_aptitude_formulas.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/xubufizalanadirebuvomizix.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/cub_scout_bear_requirements.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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 5132 bytes
SHA-256: 03f732194f5f4871a860edf8315a21e958ea61a4c4c948f9350d3448bff0201f
font_01_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 11068 bytes
SHA-256: 163ab06536b4c719200b2eda02d1a9e7e55e24e10f8468f5cb5314e0c3bc2fd7

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