Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4777a7e6611261b…

MALICIOUS

PDF

73.3 KB Created: 2021-01-12 14:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c0ed3a127b57a7ee32ebd584c4efb1cf SHA-1: 81e578f592d8e228a954f6fbf5fd7aeecfc64c05 SHA-256: a4777a7e6611261bf541fbdba6138b800d3bd7d75eee4f1f24ac2f6857120c25
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'trafffi.ru', suggesting it is designed to redirect users to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing attempt to trick users into downloading further malware.

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://trafffi.ru/aws?utm_term=materi+sistem+akuntansi+keuangan+daerah+pdf PDF link annotation
    • https://mesakejaj.weebly.com/uploads/1/3/4/7/134754162/f6deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_5fb2b3b244a6b.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/1985478.pdfIn PDF document text
    • https://site-1168315.mozfiles.com/files/1168315/26816550088.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/rosejedezirulas-vanuz-tejezaru.pdfIn PDF document text
    • https://judunuxazivu.weebly.com/uploads/1/3/1/4/131453245/969634.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/1880416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5fd68dd89f8d7.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/wopari/crossword_quiz_answers_animals_level_4.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/autodwg_to_dwg_converter_2017_full.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/dg_vaishnav_college_arumbakkam_chennai_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/trainer_battlefield_1_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/24633300645.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/blur_image_in_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/all_my_loving_violin_sheet_music.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_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 5492 bytes
SHA-256: 029562e6271645ad5dbb0e5b79e0ab2cb614df8d7a35080f8145f2ab9f713f92
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 10132 bytes
SHA-256: 99d03354d257389d8d3c73fce5bf79e5a531fea6319568b6d7eaacd29234f075

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