Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91988e93e91830e…

MALICIOUS

PDF

64.7 KB Created: 2020-12-04 21:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2233fdc3a4b2f767bde86b5d59188cd6 SHA-1: 916e2cddcfd7bd9148f9929fc03a1da476cd4d50 SHA-256: b91988e93e91830e8b1591d2279057d44eeffb7ae8c401022d3d258168346a4a
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains an embedded URL that directs users to a suspicious domain, likely to host further malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to visa applications.

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://trafftec.ru/aws?utm_term=cover+letter+format+for+singapore+visa+application PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f89073295d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_5f98a2ef2dc00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f8884d277730.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/jewizopukuni/25807527274.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/outdoor_life_the_ultimate_survival_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66fe517e72026400ff170/t/5fca52fcee400360df06871e/1607095037427/football_shop_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/2_room_and_a_boom.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/dababy_babysitter_instrumental.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/pine_tree_3d_model_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/atresia_ileal.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/bootstrap_portfolio_templates_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/14271961714.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/hades_drinking_horn_meaning.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_off0000c252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC252 5300 bytes
SHA-256: 798f01b8b9b5535c7c18ca287dd994dedbba9d887adcb4852ddd5181c717bffe
font_01_sfnt_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 9852 bytes
SHA-256: 31dc93ab1fe1d54437ed1bdbd0115d3a23474183be242d7f181c8c7cded41142