Malicious PDF — malware analysis report

Static analysis result for SHA-256 836986f9d579b9f5…

MALICIOUS

PDF

100.5 KB Created: 2021-02-13 22:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8c188045c5e3f5d2a8cc4ab3cad6ccc6 SHA-1: c5980d036bc10324b2951b4e4592066f94d06919 SHA-256: 836986f9d579b9f5a4a37153c241e0c6cb3fa000409137b11c85d3a732ef49a5
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. An external URI pointing to 'baarspo.ru' was extracted, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/aws?utm_term=%25E4%25B8%259C%25E6%2596%25B9%25E5%2587%25AD%25E4%25BE%259D%25E5%258D%258E+antinomy+of+common+flowers PDF link annotation
    • http://smcjd.com/minecraft_apk_android_sin_licenciamcpe9.pdfIn PDF document text
    • http://heliusdesign.ru/lefoxabovewosifopakoxkle8.pdfIn PDF document text
    • http://naturaitalia.space/xuxewisodamepadakadifvp5ot.pdfIn PDF document text
    • http://irisca.online/81139845434tyeyi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467910/normal_5fc728d17f204.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/putelekireza/bruchrechnung_bungen.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/51958265429.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/plumbing_compliance_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/kavurisu.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/12762851584.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/mitumuxasakepuxizutafor.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/basic_electronics_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/bams_4th_year_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/fagaruxape.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 6824 bytes
SHA-256: b7d06c2add823c06398941ce4a423335f40944484bf1a0478b9c12a5b67f0174
font_01_sfnt_off000138b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B3 4192 bytes
SHA-256: 7c4677a9ea0a64c7b16e34d5df37489a997963d814885d63c1946559d71c8daf
font_02_sfnt_off00014765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14765 5128 bytes
SHA-256: ceff8fd3e0d049d954af3218bacf4a0a710445bae81e21a60bcb7f267106aae4
font_03_sfnt_off000158d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D6 12140 bytes
SHA-256: f22a919640600c639241febc79253ed0be85d2404fff2e4aa6789b3f68663f04

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