Malicious PDF — malware analysis report

Static analysis result for SHA-256 de67c4d48e266bc4…

MALICIOUS

PDF

84.0 KB Created: 2021-04-01 04:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f268aa3e6a4ca1a08acde82f8ea205f1 SHA-1: 10edfbb42983962b4e8e69e5cda2ee6670c8d7ae SHA-256: de67c4d48e266bc49d8c757876d4168da32f2ce21862c257be5a0d3d4d929d19
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and an embedded URL. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to mathematical forms, which is likely a pretext to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=polar+form+into+cartesian+form
    • http://callipakk2.site/soxum23hpe.pdf
    • http://arenda-comp.space/vedogoseq1ygh.pdf
    • http://1xbet-registr.site/lux_tx9600ts_problemsbrlol.pdf
    • http://confirmyourverifiedbadge.com/6478450393813k2i.pdf
    • http://goldstein.berlin/is_betty_crocker_frosting_gluten_freec1j6h.pdf
    • https://cdn.sqhk.co/nugilatunu/yidKWnU/kodiwazezisowuwof.pdf
    • https://cdn.sqhk.co/zojoguxuban/p7hfBYm/cute_funny_gifts_for_boyfriend.pdf
    • https://cdn.sqhk.co/zivuzigup/119vY8w/xozuxapajet.pdf
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/6225650.pdf
    • http://mon-cmbretagne.best/5904842973166dgx.pdf
    • http://metryck.info/aunque_nadie_nos_vea_yo_soy_tu_amor_prohibidoh0fgf.pdf
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/nitunupirudemasa.pdf
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/tolikutonizefab_dizog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_d66a5e32767e41f48c6df70cf13a3747.pdf?index=true
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_fa1d1fb3b5ae4ca08043c38c71ce9789.pdf?index=true
    • http://numivonef.rf.gd/kawenoponodawete.pdf
    • http://bitibidebizofu.epizy.com/sizajudipajulitivufad.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e211.bin
99fe3f4e1cab94ea0e01b993dc1b6f178dd3b47fe58920bc057201dda0857eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 6660 bytes
font_01_sfnt_off0000f290.bin
94280829533f0e127bb768afbeb8546cb0c0a522ec806fdd7d2e1108e25351c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 5028 bytes
font_02_sfnt_off00010396.bin
d5cd19c155cb93938600d14d910bdea38115c62ee75a56422be65e89899e05ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 11464 bytes
font_03_sfnt_off00012b19.bin
5acfcad2f4a7dccb68f262203ac2f501498386909e03a972ff2319de538de91a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 16268 bytes

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