Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cb1d7092d2dc89…

MALICIOUS

PDF

72.9 KB Created: 2021-01-17 09:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 45b09582a64917b3c2f8d1394fb64fd6 SHA-1: dc5c82c84eaf9367db3b2af4bbc625d8a0e10351 SHA-256: 31cb1d7092d2dc89e34b2e7d838ce547963af33f4a3444e2153dbe607f536b26
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The primary indicator is the embedded URL which redirects to a URL associated with phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to immigration, suggesting a lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://traffnew.ru/wb?keyword=nova%20scotia%20express%20entry%20processing%20time PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5fdbc0b654756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_5fc6820f9c69e.pdfIn PDF document text
    • https://site-1175681.mozfiles.com/files/1175681/51112933644.pdfIn PDF document text
    • https://site-1175796.mozfiles.com/files/1175796/chitralahari_movie_ringtones.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/RRdESsL/light_green_room_colors.pdfIn PDF document text
    • https://site-1172743.mozfiles.com/files/1172743/zokefusanowarobisenaja.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/hhAicqh/63991147559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_5f9dbca3260f5.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/bofake/concatenate_2_excel_sheets.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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 5420 bytes
SHA-256: 6f2fceabfd8bd0c324ce2fe045b22d845d8c6f7a28126a4057f263ecb22a7ea7
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10364 bytes
SHA-256: a8c00ad9b39c37eb9f71746e4ec99a41ab395ce385508e42a2230e446259e9c2

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