Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d93b2bea1c8dd6…

MALICIOUS

PDF

70.8 KB Created: 2021-01-09 11:06:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 03b4cd675a1dadb063bc122971e1abeb SHA-1: 7fba81d0fd172c4885baf9d6c51debd31f81597d SHA-256: b2d93b2bea1c8dd6541d4441044026f0870f89c533e0163b128317f8c09055db
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, identified as a phishing attempt by ClamAV and a machine learning classifier. The document body, though heavily obfuscated, suggests a lure related to 'workbook answers', aligning with a phishing pretext. No scripts were extracted, but the presence of a malicious URI is a high-confidence indicator of malicious intent.

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://trafficel.ru/123?utm_term=measuring+up+workbooks+answers PDF link annotation
    • https://cdn.sqhk.co/dodufiruw/cnhh7hg/vobetibemeg.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/r2ichjo/41910993389.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/qjces4s/mitanojoju.pdfIn PDF document text
    • https://cdn.sqhk.co/tidelefuzin/lEicITR/kavotoderazadokodi.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/bC9hh7r/business_simulation_game_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/23704bf1-d18f-43a6-b62c-04f2f434cdf6/difference_between_illegal_and_legal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667acf68-f95c-4411-8c26-6fe1c0849fc8/59301972728.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/pogo_cheats_bing.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/mefarinuxawuvopudanew.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/basic_sql_query_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89681e83-11cf-487c-8b1d-46d0faa824a2/58466099520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e5989a-6367-48f4-b425-c0c448f337de/lefun_health_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/lojimelijalolufap.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_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 5256 bytes
SHA-256: 4d7e377e606f8d6dab3dae39fc55bac5a42d005200524212cf634f28d0fcc4be
font_01_sfnt_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 11984 bytes
SHA-256: 83ed47b6143a7ae21428248764736a3ad658b281cc805c85c59220c0998673c5