Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9f7739b5eefd1a…

MALICIOUS

PDF

79.6 KB Created: 2021-02-15 07:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ad10064d563613ad6f08dfb12c8a944 SHA-1: 5925a26442f3483e0fe65e46ce6f924e9803c530 SHA-256: cb9f7739b5eefd1a76ae1235c4ea9b5aad548e54f23c630460402a281d60eaa3
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted, but the presence of external URLs and the overall malicious verdict strongly suggest an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=calineczka+ba%25C5%259B%25C5%2584+pdf PDF link annotation
    • http://loxokunetuladi.66ghz.com/32357714298.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/aepCdAO/kilijixedefukipiveme.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/blush_formal_dresses_short.pdfIn PDF document text
    • http://bisipatelaloguj.66ghz.com/59906118828.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/fofeguj/old_scroll_ppt_template.pdfIn PDF document text
    • http://lejopuluke.rf.gd/31831203763.pdfIn PDF document text
    • http://suxivivuvadife.rf.gd/febrile_seizure_treatment_guidelines.pdfIn PDF document text
    • http://sixanuramusasit.epizy.com/56963447502.pdfIn PDF document text
    • http://jawevobafepen.epizy.com/xumororinenuzijitaposu.pdfIn PDF document text
    • http://varaxekewuveza.epizy.com/sukukibisomijoket.pdfIn PDF document text
    • http://geduzesibasax.epizy.com/durga_saptashati_telugu_gita_press.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/rewova.pdfIn PDF document text
    • http://visiporogid.epizy.com/always_on_time.pdfIn PDF document text
    • http://kodadus.epizy.com/cisco_packet_tracer_6._2_netacad.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/regonobakuw.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/bulk_sms_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/lawiguxakex.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_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 5364 bytes
SHA-256: b3a0bc89e62ecd35ae87b067d3a672f904700e65caf0af6f42dc4ef3acaf7c2d
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 11336 bytes
SHA-256: a9e5ac43f9e241e240b2d18316f57a83c6ae1d5a3325a3c625ae5112cf5b2c10

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