Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c726c55dbc2789…

MALICIOUS

PDF

67.3 KB Created: 2020-11-12 15:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e51cf7e37b01a644909a04f760fa2a5b SHA-1: 2a5e44f81c74c97c5956b9bb01a526b0b05da016 SHA-256: 51c726c55dbc27893d2260e97c96660fc58c8640990ff43ca6bcf84f06b2f0cb
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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/strik?utm_term=hymn+sheet+music+free+piano PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5f8e4ee79376e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f8d85594b9fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fa752fa9685e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f99d32c992ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_5f98f7c1ca755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c629334-35a6-4356-851f-ecbf358748c3/codigos_control_steren_rm-500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e6a602-e9c8-4efd-867a-55071bf0ff1e/10724341692.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/6201945363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc20b62-d28c-44c5-a2e4-60f4e29097a3/susd_calendar_2019-20.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/complimentary_drink_voucher_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/successfactors_workforce_analytics.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/abc_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/cornerstone_chords_d.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/what_words_start_with_the_prefix_de.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_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 5284 bytes
SHA-256: f4a5eedca390596ec1298918c55536612628ac47201e89d3c829be0dd807fa95
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 10940 bytes
SHA-256: 58a62f361e25c46c0d0e27ba25ef7929a5dcdd2da0b50c11158d06a44d226678