Malicious PDF — malware analysis report

Static analysis result for SHA-256 21571c8070bc5e01…

MALICIOUS

PDF

72.4 KB Created: 2021-02-20 04:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 161d2b1ec6514515ce2f12fecba4a180 SHA-1: 58eeb6e5bc632c5494185a432e392e731d8346be SHA-256: 21571c8070bc5e015eaadee48e03c2362b2fcb3e62aaa260ea4bfbc72bef7508
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of external URIs and the link farm heuristic suggest an attempt to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=global+trade+network+pte+ltd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393883/normal_6027879637d64.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/gadinufovik_favarujuxid_tufijuverowew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370284/normal_5ffddc759ba58.pdfIn PDF document text
    • http://povutigu.22web.org/application_android_camscanner.pdfIn PDF document text
    • http://pokafujadiso.iblogger.org/20508354472.pdfIn PDF document text
    • https://bepifesak.weebly.com/uploads/1/3/4/0/134096259/sufano_muzefogof_vosilej_tosijedatezad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_600ff6ddb5569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5fd260e0ae1d1.pdfIn PDF document text
    • https://gerikolobel.weebly.com/uploads/1/3/1/3/131398187/3647360.pdfIn PDF document text
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/tedobunelakebilab.pdfIn PDF document text
    • http://movivuvafozor.iblogger.org/glossary_template_confluence.pdfIn PDF document text
    • http://feviziwomuta.iblogger.org/wupelobesavudijen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvufewitopemaw.rf.gd/sat_practice_test_4_answers_khan_academy.pdfIn PDF document text
    • http://pubupamosala.epizy.com/surufimubu.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/7831793835.pdfIn PDF document text
    • http://mexowotevofo.rf.gd/bleacher_report_epl_week_36.pdfIn PDF document text
    • http://sifirajudexotiz.epizy.com/5433181822.pdfIn PDF document text
    • http://kabekanofaxo.epizy.com/agarbatti_business_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/buzotavimabekatex.pdfIn PDF document text
    • http://sonazorapabame.epizy.com/97411107487.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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 5104 bytes
SHA-256: a4979ea1d4ebfaa8fca6028932588e28547e3e206936328b61ca1054c9fb1ada
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10808 bytes
SHA-256: 90a4326861e3ee1d12d79e7653e9b47d55f5a0258e649caae871aa8436ea1a8e

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