Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81e4912f828ac4e…

MALICIOUS

PDF

74.6 KB Created: 2020-12-23 06:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ff6f0696bfff4a499a3aca9e63de6946 SHA-1: 0b8c204c378bf9fcf4b4836dcb84209b312defc3 SHA-256: a81e4912f828ac4ef0d7adc857c2565a601e0d6910e774627a5b830ee0fa435a
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL that directs users to a suspicious domain, likely for phishing purposes. The PDF structure and embedded content suggest it's intended to exploit user interaction to redirect them to a malicious site.

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://trafftec.ru/strik?utm_term=flipper+anderson+record PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461780/normal_5fa204b1633ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5fad792f54654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_5faa4f6a5e220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463810/normal_5fc8ba47a335f.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/lupuvogotog/fijixurekogavabef.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc01930403f5353fd916186/t/5fc110d3e18c5c478e217cfa/1606488277413/bekili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5ffe96-8df4-4172-baf4-a2e99204aa7f/wenaruzawumapafafuju.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/conjunction_worksheets_for_first_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/scert_admit_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e403ab55-1e92-4f19-89c0-8daa007aec40/el_libro_del_cementerio.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/46115149738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b16f91-9458-407f-875e-e8c466acd2d7/2172355774.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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 5020 bytes
SHA-256: 1cb2edf463a408239f3eba99163462877247f6de9ce556ee08a8a397e0164b75
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 10556 bytes
SHA-256: f1f32d1457130701569664154e555eef81b2ce831c663997b9fae9e085ef7628