Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccde22430f93fac…

MALICIOUS

PDF

86.1 KB Created: 2021-02-26 03:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 867d37e4929c795bf837bfe9afa81c01 SHA-1: b0f990c98ffdf80228fb3b9c48cda979ab5c822c SHA-256: 5ccde22430f93facddd3b4305ac001da8de34c29684de37ef08654de754ad444
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=the+5th+wave+sequel PDF link annotation
    • http://usmileofficial.site/rufitanewerajedazabugikuxbcp15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_5fe80c69315ca.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/uJhiQ94/rock_ringtones_free_download.pdfIn PDF document text
    • http://vugezaselefobop.iblogger.org/catalase_test_lab_report_conclusion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_60224f8d24f0d.pdfIn PDF document text
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/5411803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_602ee924360ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483071/normal_6008eff6b978d.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/cjLitgg/voicemeeter_banana_discord_echo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474727/normal_601dd679780f5.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/a963328d96f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_602396feb5717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_601917a504df1.pdfIn PDF document text
    • http://gugaroro.iblogger.org/torarol.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/5273539.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/4388026.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwefijegiv.epizy.com/garfield_hollywood_movie_tamil_dubbed_hd.pdfIn PDF document text
    • http://kebafitesulodu.epizy.com/xaxujonomaxasire.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_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 5028 bytes
SHA-256: e50f638e12a572c6ae0dd85bac999a0a4adfc52090e0940a44098dd609472bee
font_01_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 11904 bytes
SHA-256: 7188f107307860129b993a03f0ec1895f9d0ab446975ae5511de4f2d629fc3fb

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