Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90eedec1c918de7…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 13:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e56f8d967b60c6cc1976f3ba7650491 SHA-1: 49bfae38f23e6498c57e7f9c60ec2e765187cd07 SHA-256: c90eedec1c918de7f74ebcfad5c55be8e7e31d5d8830025c8c2d1ac15af10b6f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The document body, though heavily obfuscated, appears to reference legal text, suggesting a lure to entice users to click the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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/123?utm_term=section+138+of+negotiable+instruments+act+latest+amendment+2020+in+hindi In PDF document text
    • http://metryck.info/bopidafumejenujewukvr55j.pdfIn PDF document text
    • http://copyright-central-media.com/what_is_knowledge_sharing_behaviouri7suk.pdfIn PDF document text
    • https://wubudebekezame.weebly.com/uploads/1/3/0/7/130740051/f696fbeb.pdfIn PDF document text
    • http://keep-travel.com/dometic_fan-tastic_vent_model_7350q8by8.pdfIn PDF document text
    • http://sandiego-podcasts.com/cancer_pulmonar_de_celulas_no_pequeasuqyzx.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/pabum-pizotorixo-lurev-jasetasuxine.pdfIn PDF document text
    • https://rawebitor.weebly.com/uploads/1/3/4/3/134337567/9870110.pdfIn PDF document text
    • http://cparta.moscow/bigujirolelabowidufudo6msd.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/ghgcidu/spaceflight_simulator_1._5_blueprints.pdfIn PDF document text
    • http://ek-arenda.ru/shipping_manager_3_guide1uf6t.pdfIn PDF document text
    • http://esclub.pro/animal_tissue_culture_techniquest1t14.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/kjdG1hj/pajijubokakovenediwufuga.pdfIn PDF document text
    • https://zirejuvisipaz.weebly.com/uploads/1/3/1/6/131636922/luzejotu.pdfIn PDF document text
    • http://dom-bita.org/kebemuzexanisitinojivicfge5.pdfIn PDF document text
    • http://womans30planet.com/florez_farmacologia_7_edicionewcqq.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/sisaxu/25880389962.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/codehs_basic_js_unit_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/elements_of_statistical_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/biology_sample_questions.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_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 6364 bytes
SHA-256: c1063111e1654dc18832713ec4dfd7c478f9898c53298cec68beb0def4cece7e
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 10776 bytes
SHA-256: 99c70a3fee0d265dfc6081026719cf2de686ee737f8cea1fe1f3cea077394585

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