Malicious PDF — malware analysis report

Static analysis result for SHA-256 31529744c954e662…

MALICIOUS

PDF

77.2 KB Created: 2021-02-08 21:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3bef391d126492f7832c118ca74b93d4 SHA-1: a78c0120e2f4842ca5f84c81ad66d68da9b7f0b2 SHA-256: 31529744c954e6624d04612f0a29b58f8ab68a24cd7d9e7a8a28ed9b0c3c8549
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/wb?keyword=devexpress%20report%20mvc'. This URL is presented in a context that suggests a phishing or social engineering lure, likely attempting to trick the user into clicking it. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/wb?keyword=devexpress%20report%20mvc In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454825/normal_5fee18c9b0a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372681/normal_6007bfcb119d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fd17e985bc40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_6021555a0cc65.pdfIn PDF document text
    • http://wukifiduputafeb.22web.org/action_verbs_worksheets_for_grade_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388165/normal_5ff6a9f64f478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_600ee8d1ec516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5fe2bfd01abd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_601ba7f8cc025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369501/normal_600306b89fc70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5feb4cff211f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464709/normal_5feefa12d87b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_601f547350d7a.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/jiwisi/cascading_style_sheets_means.pdfIn PDF document text
    • http://rafodize.rf.gd/60815870447.pdfIn PDF document text
    • http://penoputibilexo.rf.gd/88414758195.pdfIn PDF document text
    • http://vulikoviluxugu.rf.gd/concise_oxford_english_dictionary_12th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/pikom.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/pelamapevatadoxodonuvibo.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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 4964 bytes
SHA-256: c91e02446a460c211ddfcfcb8a3648689fafebcd346ca1193036453df4b0cc6c
font_01_sfnt_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 11816 bytes
SHA-256: cbb49b9032bd4684773a693ab6e893132909a09cc262b08b5e3643cc05cda0d3

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