Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7f0fb4a56cd502…

MALICIOUS

PDF

72.5 KB Created: 2021-02-18 11:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 031ebaa3d879d154c208b070cd05b0db SHA-1: b0c5b3d984ab608220a422db6012a13772378689 SHA-256: ff7f0fb4a56cd502f0d419b35e1f24efe7f699176a6e4d1fe963eee3ea994c1c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary URL, 'https://crophysi.ru/strik?utm_term=very+difficult+hidden+pictures', is likely used to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/strik?utm_term=very+difficult+hidden+pictures In PDF document text
    • http://xevozunufu.iblogger.org/60685521077.pdfIn PDF document text
    • http://renakejopipelew.iblogger.org/free_printable_writing_worksheets_for_5th_graders.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493890/normal_5fce940dd3aea.pdfIn PDF document text
    • http://mibajisokawetu.iblogger.org/golds_gym_power_spin_230_r_recumbent_exercise_bike.pdfIn PDF document text
    • http://profyhouse.ru/bilateral_inguinal_hernia_repair_guidelines4bk7b.pdfIn PDF document text
    • http://my-credit.info/susokotizepigozapifisewpseu.pdfIn PDF document text
    • http://onatural.space/84210876584nkhba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fc56fd52a251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371244/normal_5fc7f75ade087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_601b0bef541b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fc839cb2b151.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 5100 bytes
SHA-256: 8fa09bc22bc5c29ab9e04b9d6a1f2e4083dda31c08100aa7ba42745a7bd79f70
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10428 bytes
SHA-256: 9d439cdbf2c2b70468a3601a208fd69967a446830f23072b1129cdbb06a578fd

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