Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcb16460864ce11…

MALICIOUS

PDF

68.3 KB Created: 2020-11-21 06:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f9f24a959f10ee93b9a9179654ae7c28 SHA-1: bed9e8ec8616380e1c9f0ac94e352b6d746ef56e SHA-256: 3bcb16460864ce11bbf6fc06379475da641d26a1610837d1fdcebe2252adb8d4
214 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to drive traffic to potentially malicious or SEO-manipulated content, possibly for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=apache+tomcat+8+64+bit+free In PDF document text
    • https://gematisi.weebly.com/uploads/1/3/4/5/134599806/3577875.pdfIn PDF document text
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/7127257.pdfIn PDF document text
    • https://lewixixidofuj.weebly.com/uploads/1/3/4/3/134393564/7711636296723ce.pdfIn PDF document text
    • https://vefupidukubimaz.weebly.com/uploads/1/3/4/5/134597042/wojopelizepigi-buwidatukupuf-pijebanodon.pdfIn PDF document text
    • https://vujerige.weebly.com/uploads/1/3/4/4/134467486/sulujopaxibokip-jezaredipufume-kijigowivomag.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/legobegutulo/calories_in_sheet_cake_with_frosting.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/indian_hypertension_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/arbeitslosengeld_beantragen.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/iron_man_cake_template.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/dc_shunt_motor_experiment_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/natwest_sending_a_chaps_payment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/the_santa_clause_2_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/opteck_trading_platform.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_off0000cc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC08 5608 bytes
SHA-256: c43901522674773a7b6098a7826fe2ba764e180ef137884d150220126b70e0bb
font_01_sfnt_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 11104 bytes
SHA-256: c62334f2b8f7a5181f5dfcfca42fb23401b493c28074e45f06cd84548f5f4dd2

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