Malicious PDF — malware analysis report

Static analysis result for SHA-256 25028880a80d1cf6…

MALICIOUS

PDF

74.5 KB Created: 2021-03-26 09:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 094dd3c2c2c95e8a9d2040c4804f0a45 SHA-1: e534a4f00da33f2496fa885519da08207ae2ca42 SHA-256: 25028880a80d1cf6ce5a693c346e16691eaf256900f61dd0db12aadeb7645cb1
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that points to a suspicious domain, and the ML classifier and ClamAV both flagged this file as malicious. The document body, though heavily obfuscated, suggests a lure related to 'enzymatic activity', likely a pretext to direct the user to the malicious URL. No scripts were extracted, but the presence of external URIs and the strong heuristic detections indicate a phishing or malware distribution 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://vilenefex.ru/123?utm_term=actividad+enzimatica+catalasa+pdf
    • https://cdn.sqhk.co/gudopokobipa/jgWCo7L/draconius_go_catch_a_dragon_mod_apk.pdf
    • https://cdn.sqhk.co/puxolika/jjgiZDQ/bricks_breaker_giant_balls_mod_apk_unlimited_money.pdf
    • http://zodoworusa.22web.org/beaver_builder_agency.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_f0f56bbbc2b84283bf5c50184742f82d.pdf?index=true
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_fad2a34ad8b24ac78f79ef417ab4e503.pdf?index=true
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_75d070dd8f93498c92fde20c85ee2b21.pdf?index=true
    • http://nabowiruxurupob.rf.gd/moriwijafidobupilowenod.pdf
    • https://s3.amazonaws.com/tinivukedeta/78322774885.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_b1bec752edcf42c0b8749499e34682b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38486ef0-02a2-4052-aafe-09c27f6b2e71/12474552817.pdf
    • http://kepelagivon.rf.gd/verbal_reasoning_example_questions.pdf
    • https://s3.amazonaws.com/degisapemifa/65033635101.pdf
    • https://uploads.strikinglycdn.com/files/92bad5fc-d988-4f1c-8a37-21b6095cf7fe/how_to_reset_a_vending_machine.pdf
    • https://s3.amazonaws.com/rerinago/zipekikujiwefaxe.pdf
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_50358dc2ad6f4a6e85892cae5f9fc3f6.pdf?index=true
    • https://s3.amazonaws.com/punurum/how_to_rebuild_a_hypro_centrifugal_pump.pdf
    • http://suvokejixu.epizy.com/symantec_dlp_15_agent_not_reporting.pdf
    • http://pelukinig.rf.gd/7_chakra_meditation_music_free.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf4.bin
5b0bef012803dcdc7c7bc0da4ea248b3a3cb68fce3d6f67c7cce4d85c1682ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 5304 bytes
font_01_sfnt_off0000de08.bin
21f8e0e2a1b8fb14ed65d38fcfa98425870dd34b3d75982f2fb5289562fea5ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 12140 bytes
font_02_sfnt_off00010602.bin
01e49661dbdd7b4823267156d85e4b6ddc25a6de2ac0af4d78c137cfa2b371b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 16100 bytes

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