Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb99670f7e3ac553…

MALICIOUS

PDF

92.8 KB Created: 2021-03-25 15:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03733a18776b44817ba20e467ee291ae SHA-1: 4265ac743a333a7af8eb8c3b65248bcc77729260 SHA-256: cb99670f7e3ac553483627cf5ccb1adf74a16c043a17b1542a2958d93cd01cf1
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, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body is heavily obfuscated, but the presence of the external URI and the overall detection suggest a phishing or credential harvesting attempt.

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://druttle.ru/award?keyword=sintef+byggforsk+pdf
    • https://cdn-cms.f-static.net/uploads/4372361/normal_601587b616efd.pdf
    • http://islemleriniz.org/782595139157swo9.pdf
    • https://static.s123-cdn-static.com/uploads/4372982/normal_5fcea6e45989b.pdf
    • http://dreamingdeveloper.com/bootstrap_horizontal_card_templateebwdz.pdf
    • http://introdom.ru/engineering_geology_by_n_chennakesavulu_downloads55a7.pdf
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5fe58ee2e0f92.pdf
    • https://cdn-cms.f-static.net/uploads/4480878/normal_5fd7c0238ca0f.pdf
    • https://cdn.sqhk.co/mugegiduveb/jUxnC1j/juvaxuwidota.pdf
    • http://pmaider.com/synthesia_10.3_serial_keygevck.pdf
    • http://gk-kuban.ru/995896442298vwn0.pdf
    • https://cdn-cms.f-static.net/uploads/4370303/normal_600a552f8fa67.pdf
    • https://cdn.sqhk.co/xiruregexibe/hVT0jgy/quickbooks_inventory_adjustment_report.pdf
    • http://zivodelozino.iblogger.org/nopax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sirovak.rf.gd/54201114184.pdf
    • http://devugagevubuz.rf.gd/binomial_theorem_practice_worksheet.pdf
    • http://sebubexegan.rf.gd/mcq_answer_sheet_format.pdf
    • https://uploads.strikinglycdn.com/files/9ea84cee-ea08-49e4-acf1-fa944428da18/purukibop.pdf
    • https://uploads.strikinglycdn.com/files/b69af49c-0140-4457-8017-6d7e9748e6a7/93882117496.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c58.bin
cb6691eef1ed11f995fe1f00c3bfd11dd47567bd54251a71dc8c7bf530c2c585
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 5376 bytes
font_01_sfnt_off00013ebb.bin
9a9152cdfeecc3524fa3c81abe01ad7e976a917fd3f4f73030c9ee1fa0ecee51
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBB 12340 bytes