Malicious PDF — malware analysis report

Static analysis result for SHA-256 284b4c0054bede29…

MALICIOUS

PDF

66.9 KB Created: 2021-01-09 23:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 23f381d1e19b66069bf1964d5611497a SHA-1: 87b04c63c985984106b8b708a97977bae1c1c069 SHA-256: 284b4c0054bede297789b77d68fbbe8be4762deec13ce460807c8ac2d72eda1f
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, traffset.ru. This, combined with the ML classifier and ClamAV detection, strongly suggests a malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to weather reports, indicating a lure.

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://traffset.ru/aws?utm_term=weather+report+north+hudson+ny PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5fe5d26886a57.pdfIn PDF document text
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/basopukarojano-difedidune.pdfIn PDF document text
    • https://site-1172267.mozfiles.com/files/1172267/27209822585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fb59690730cb.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/mivupujipezizom_ditamakeju_vumufasosabur_rijogebowanopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5ff146b450160.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/NkibIhb/94041602376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5fdc67643fd6d.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/veraxawewib/free_thanksgiving_math_worksheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/best_manual_espresso_machine_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/ayo_and_teo_last_forever_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/attitude_shayari_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/doulos_uvm_coding_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/aashto_classification_of_soil.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_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 5128 bytes
SHA-256: cb3013c9f75a08fec0cd11ea4aa4cbd9f67b86dcbbb384217bc04e0b9e5ccfcd
font_01_sfnt_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 9932 bytes
SHA-256: bc1bf427aebf71174bcb9e8934c39583254ef81522858509ed46217207317ba6

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