Malicious PDF — malware analysis report

Static analysis result for SHA-256 1066771622b91c5b…

MALICIOUS

PDF

74.2 KB Created: 2021-04-08 02:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9dd2b3b77d5982dbf8626b7abab295a5 SHA-1: 3f284797f49c1ea0401246d7d796e076bc9b022f SHA-256: 1066771622b91c5b2774e7a3121a4cc294dd02448d844d8e233480fbcc07333a
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The presence of a link farm on disposable hosting and a specific URL related to a 'Netflix error code' strongly suggests a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links indicate 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://jacksth.ru/strik?utm_term=netflix+error+code+ul3012 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487419/normal_5fc5bf70e5afd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406229/normal_5ffe0e45b89c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_5fd6e645dcd6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478664/normal_5fee616e97e6a.pdfIn PDF document text
    • http://fusozurima.22web.org/literary_theory_and_criticism_an_introduction.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498702/normal_600ad6e97efeb.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/55356338757.pdfIn PDF document text
    • http://sazaleve.22web.org/jefakozopobezijusojigemef.pdfIn PDF document text
    • http://fudetigupapafa.22web.org/social_contract_theory_of_hobbes_locke_and_rousseau.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_603f1c3ab8cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_603344b36825f.pdfIn PDF document text
    • http://pixilapusir.22web.org/chrome_extensions_android_tablet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojozore.myartsonline.com/application_letter_for_engineer_position.pdfIn PDF document text
    • http://rewivelu.rf.gd/moto_g6_play_battery_price.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/deroxagajakedeleferu.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/32945242070.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/rimotiwumuxamifa.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/beruw.pdfIn PDF document text
    • http://fewodekikagusag.rf.gd/xalezefelam.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/mists_of_avalon_plot.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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 5156 bytes
SHA-256: add343f67341adc2b5d3a848d43e276fc9258ba2bc4cafcd4d0dfd91d9cb7902
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 10552 bytes
SHA-256: 20634cfcee56907c0279285785f04d7f085e7cc7ed3b6703d2bcebf566837ca4

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