Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4a635843d85d51…

MALICIOUS

PDF

74.2 KB Created: 2021-02-15 20:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a5285bea6de0835ea1f6d4d9b6dc8a80 SHA-1: 220ec44a9c36f51189b0d9faba85179ac5149c2c SHA-256: ec4a635843d85d51a8da8bb1c054cede66b43bb566aa602e44748566f0dd6e8c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains embedded URLs, one of which, https://yafferge.ru/strik?utm_term=what+is+an+argumentative+thesis+statement, is flagged as malicious and likely serves as a redirector to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to academic writing, suggesting a phishing or social engineering attack.

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://yafferge.ru/strik?utm_term=what+is+an+argumentative+thesis+statement In PDF document text
    • http://shortsomfj.space/75207762198zriml.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/FjfzHjf/xoxujanawefev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5ff10be8c00db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_5fe92197e9228.pdfIn PDF document text
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/fuzipafajutur.pdfIn PDF document text
    • http://martans.space/chips_movie_freew8vvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479674/normal_5ffcf0f630db8.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/lupozotovidusutovumup99b8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376099/normal_5fd06cbe0338b.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/pazatuv/gubutazekezub.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/aprendizajes_clave_primaria.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/forifaweduxalimuduvujajer.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/former_speaker_of_the_house_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/kilemimawu.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/lake_michigan_wave_report_ludington.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/2485032739.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_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 5140 bytes
SHA-256: 454ab14600902a656dd383eec52c7484bf487dc57a90de562ac8ea2ec3c89a2c
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 10300 bytes
SHA-256: 5e2f54cc9080b47912ecbac81e52c9099d0e8734fc81a7743495660605403f81

Open this report in the interactive analyzer, or submit your own file for analysis.