Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaedd225d83ede8…

MALICIOUS

PDF

82.2 KB Created: 2021-03-24 02:38:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6f3ddcec6ce9f77e4a602810ad466d6 SHA-1: b31373b89b1e1396b82a16d1f1358c78c0d2092f SHA-256: 8aaedd225d83ede8c6b394149c206f12d978ce05eb89526efb05e9cc68f273b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, with one prominent URL pointing to a suspicious domain ('kuzutuzo.ru') that appears to be part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, suggests a pretext related to legal research to entice users to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/wix?keyword=legal+research+authorities+and+option
    • http://artistichomesolutions.com/9347760240423j8r.pdf
    • http://kikababono.mywebcommunity.org/propiedades_fisicas_y_mecanicas_de_los_materiales_de_construccion.pdf
    • http://reduslimitalia.website/davivebokikuzarobigyadhn.pdf
    • http://legendnat.space/namakanuxumejovixis5ttf.pdf
    • http://sigixexizo.sportsontheweb.net/42405902719.pdf
    • http://jidobefom.iblogger.org/happy_birthday_music_sheet_violin.pdf
    • http://resipowepo.getenjoyment.net/41320853429.pdf
    • http://bemoxanomazopix.iblogger.org/bojib.pdf
    • http://nosilekexiwot.mywebcommunity.org/abstract_reasoning_questions.pdf
    • http://vivubowi.getenjoyment.net/95044212781.pdf
    • http://losiruwu.66ghz.com/bmi_guidelines_for_morbid_obesity.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_de93ab88957e47bf8f1744e320691c07.pdf?index=true
    • https://977e9bd2-40c7-4150-853a-d4bf381d717f.filesusr.com/ugd/fe0276_509770f2a14044b78b4c9b9d556c2312.pdf?index=true
    • https://s3.amazonaws.com/fifomi/24476380108.pdf
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_1bddb6f61a074193b41c4e7f82a2b6e1.pdf?index=true
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_d100041391d341d182a911dbbed0d0a7.pdf?index=true
    • https://7bfa0b14-7c42-4681-af51-c5eb670ddee5.filesusr.com/ugd/e54fc7_c4d2035597c947319bee1531317877b4.pdf?index=true
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_4f1dc86d0a5f4bc3a7093735db9c151f.pdf?index=true
    • http://vifebekomese.rf.gd/69009702463.pdf
    • https://s3.amazonaws.com/rezugekolaba/free_software_avg_antivirus_full_version.pdf
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_63d16704c5a84d0e8d2d962be28993c7.pdf?index=true
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_eec27d70397e46e793a0faa4ec3e8a60.pdf?index=true
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_c3243bdfde2b47a282ba20775cc9bd3c.pdf?index=true
    • http://mogerokefo.epizy.com/88569623998.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_d2be903374a04d649163e95bd513dc30.pdf?index=true
    • 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_off000102a1.bin
d2d0f7ba9b5e7bcd378c376939236938e3225e554066929ce0e514798420303f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 5276 bytes
font_01_sfnt_off0001148f.bin
0531dcc01369dd8fb6d3f774369b9629bf73925e0fe523f2de177fcf8e9ed200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 10720 bytes

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