Malicious PDF — malware analysis report

Static analysis result for SHA-256 f845dc809175575a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-25 17:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 39a7078ad2d04c09a3daaa78600bc614 SHA-1: 8cb064f26c533dab523008da736aad1794ebb2ce SHA-256: f845dc809175575a88521051e262c9e37c065e1164c663a8eae5205cc845999a
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, contains text that appears to be a lure, suggesting a phishing or malware distribution attempt. The presence of an external URI and the overall malicious classification strongly indicate a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/strik?utm_term=can+a+man+cause+cervical+cancer PDF link annotation
    • https://cdn.sqhk.co/bokupajokim/hgqTaIY/apple_music_login_on_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_6027c8b516da6.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/the_little_sas_book_6th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_601d5a1e482de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5ff40fd93aa91.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/is_there_a_mortal_engines_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/fjjibQH/subibezuruwiki.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/NhhEYjj/gas_prices_in_california_april_2019.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/descargar_audio_biblia_reina_valera_1960_mp3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gofirog.epizy.com/24045388169.pdfIn PDF document text
    • http://sivabesu.epizy.com/chevrolet_spark_2012_owners_manual.pdfIn PDF document text
    • http://texozokuvet.epizy.com/28842140203.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/creating_word_templates_online.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/pupatizezunuguvezotil.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/casio_fx_991es_plus_scientific_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/facebook_marketing_blueprint.pdfIn PDF document text
    • http://vojamul.epizy.com/60373026846.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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 4912 bytes
SHA-256: 3fefd0cbbe1787b6cfbd6849c1b83b4f66f81d095e6cb2325bd820a2dfa9ac69
font_01_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 10808 bytes
SHA-256: bee35d430e388e9400f89cb680d8f4c67d06411eddad779beee181dfbd87611c

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