Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e7a47c3c8f2215…

MALICIOUS

PDF

93.4 KB Created: 2021-02-15 15:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: be51eeef6a33fa7762e4935ba39836d8 SHA-1: 4a1e167a51d9acae43704ac78a8205d54f021aa4 SHA-256: b3e7a47c3c8f2215515cc9da05b29af296cbfd45e9ca3677852afa887c75bf9f
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=gas+pipe+explosion+baltimore In PDF document text
    • http://hotita.fun/75405339863u8nwu.pdfIn PDF document text
    • http://kismykeitio.best/62375343426np803.pdfIn PDF document text
    • http://1xbets-reg.site/baltimore_ravens_injury_report_week_2ys4ih.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5fcc90951ae68.pdfIn PDF document text
    • http://50offshop.pro/learning_styles_2018ojkzh.pdfIn PDF document text
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/a0f700c1f.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/conclusion_for_internship_report_in_accountingr0l04.pdfIn PDF document text
    • https://jategolotigani.weebly.com/uploads/1/3/4/8/134882723/zuwabezune-bawej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5fd2f0a5b446c.pdfIn PDF document text
    • http://acupofjacob.com/formulaire_ordre_de_virement_banquefxn15.pdfIn PDF document text
    • http://ejqy.com/81803523100loj4j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pizivurapab/futura_arabic_bold_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/boolean_algebra_simplification_problems_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/senesowuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/android_open_file_in_root_directory.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/55120857701.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/77358033103.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 4992 bytes
SHA-256: 8fcda343b013af67cb905d9298a962a3a0e23d13141288b907b7a88cff16aa03
font_01_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 11000 bytes
SHA-256: 6f452bf2b7d7b9eba9328b0abd564596d3b7206d0cd7cee1d7c5f059af19b0c0
font_02_sfnt_off00015a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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