Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2ecd2fd3ef225c…

MALICIOUS

PDF

68.5 KB Created: 2021-01-05 03:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7d0a2d6dc57551f5f6f9d340cafdf741 SHA-1: 9faa6810ec5e8f12fdf2d2beadfadb2d3bf57bcc SHA-256: db2ecd2fd3ef225ce0544329a80aa4eeb6be6a8006b09f9fb5a7916e69b992d7
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'trafffi.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'chess rush guide combo'. No scripts were extracted, but the presence of external URIs and the overall detection suggest an attempt to redirect the user to a malicious site, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/aws?utm_term=chess+rush+guide+combo PDF link annotation
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/c86c521.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/sarifufevusogo-mugawukimogax-mapirose.pdfIn PDF document text
    • https://zuzigiwasozobe.weebly.com/uploads/1/3/4/6/134676944/5130218.pdfIn PDF document text
    • https://disavapiviloma.weebly.com/uploads/1/3/4/3/134351159/duxovomit.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/lPjMhcU/colt_express_walkthrough.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/vesubodufisi/also_sprach_zarathustra_imslp.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/cerebral_cavernous_malformation_resection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40295d77-4974-4e7d-a3d9-f5421651c465/security_controls_traceability_matrix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba247ac2-c399-4bae-b190-583f5147cd18/sabiston_20._edio_livre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2052a7df-2faa-4768-9462-ae9d1b5e2fb4/are_joanne_fluke_recipes_good.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_off0000cdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 5156 bytes
SHA-256: 5f1d373a7a86a0ed4caa31df2ac8a0a0e9fdf35b923eaec4511c87218b43262b
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 11608 bytes
SHA-256: 7d1c65881e1fd8e96f05b1f885b07f2c0ca19e56e7795b8dc6dfc67b878922a9