Malicious PDF — malware analysis report

Static analysis result for SHA-256 554b3cab271d4c0f…

MALICIOUS

PDF

69.8 KB Created: 2021-02-15 09:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcde97f73c0a50dd19dce28470b51cfe SHA-1: 792e8bc8951fe59726e455b888209913a5394050 SHA-256: 554b3cab271d4c0f46e7222216d418428e8188cce9b73e9d6e1dfd1405a82026
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically a 'Cartesian coordinate system worksheet'. No scripts were extracted, but the presence of external URLs and the malware detection strongly indicate a malicious intent.

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://maypoin.ru/wix?keyword=cartesian+coordinate+system+worksheet+with+answers
    • https://cdn.sqhk.co/girewobo/JXjhBNH/mutant_fighting_arena_unblocked.pdf
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/3939896.pdf
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fc7117a2a0df.pdf
    • https://cdn.sqhk.co/zimopaji/ggkSZKV/folding_bushcraft_knife_uk.pdf
    • https://cdn.sqhk.co/duxadikoti/fhgexMw/fegebezuberujozoba.pdf
    • https://cdn.sqhk.co/zodozane/N13IhdE/little_commander_2_apk_hack.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5fe6d4a90ad7e.pdf
    • https://static.s123-cdn-static.com/uploads/4490364/normal_5fce869161fd7.pdf
    • https://cdn-cms.f-static.net/uploads/4389107/normal_5fd9674db73cb.pdf
    • http://se-mrush.com/bhaskar_oru_rascal_full_movie_mp4kt0yc.pdf
    • https://cdn-cms.f-static.net/uploads/4465924/normal_5fe8ce0153a19.pdf
    • https://static.s123-cdn-static.com/uploads/4460708/normal_600995b0f13e0.pdf
    • http://vkysnaya-eda.site/ralinekilikazavoz8yey.pdf
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5fd2df7d2f0aa.pdf
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/77fef54fc83d0a8.pdf
    • https://cdn-cms.f-static.net/uploads/4447084/normal_6009d5728c89d.pdf
    • http://profaudit32.ru/iron_maiden_blogspot_discographyqmyjb.pdf
    • https://cdn-cms.f-static.net/uploads/4469617/normal_601b43e8dfbbd.pdf
    • https://cdn-cms.f-static.net/uploads/4421641/normal_5fd0ec1f03cca.pdf
    • https://cdn.sqhk.co/wogokodu/eoidhd0/clubhouse_restaurant_and_bar.pdf
    • http://herss.space/vce_pro_apk4vfe6.pdf
    • https://cdn.sqhk.co/daxerarugak/ib9vNBK/crossword_solver_nz_herald.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d42a.bin
ed73c6c13b27bd4e830b2a76189e501df29e05a92a58bb23b084c1a14c156c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 5308 bytes
font_01_sfnt_off0000e620.bin
ce69b6659f4a4ce9aacc4181e2b75d21c0e32532f2a52f46c615c9dc6caf5638		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 10436 bytes

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