Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a10323f1ffe823…

MALICIOUS

PDF

96.8 KB Created: 2021-04-06 16:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1024701b52b3f76bd3a53fcdd1898e SHA-1: a3cf862d1d8edcc6fceea1bd6a5c19f7b2cc4765 SHA-256: 61a10323f1ffe823c5be2eb0720532b3c70bde0920c3058b85002692aad74040
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically a 'lab periodic trends worksheet answer key'. No scripts were extracted, but the presence of external URLs and the nature of the detection indicate a malicious intent to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=lab+periodic+trends+worksheet+answer+key
    • https://cdn.sqhk.co/baxorurifina/thix1hg/jimmy_john_s_gourmet_sandwiches_near_me.pdf
    • http://zodatowafe.getenjoyment.net/3d_animation_software_for_free_download_full_version.pdf
    • http://bit-ipo.ru/conic_sections_problems_and_answersknztc.pdf
    • http://svoydvalend.xyz/20718563936wf2ro.pdf
    • http://juwupexutaval.mywebcommunity.org/79547627197.pdf
    • https://rirulejirosajis.weebly.com/uploads/1/3/4/3/134320684/ginogeguli_verowolexe_wivese_newipipidef.pdf
    • http://worldworkbook.com/13477463789wwcw1.pdf
    • http://boforotaje.mywebcommunity.org/how_much_does_a_500ml_plastic_water_bottle_weight.pdf
    • https://nulokumex.weebly.com/uploads/1/3/3/9/133999188/xoxijotumabe.pdf
    • https://cdn.sqhk.co/tekunipifob/1igwnjg/head_action_soccer_world_cup_2014.pdf
    • http://store50off.info/16717917426d0yrr.pdf
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/jukif.pdf
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/dilaned.pdf
    • https://kogoporerosuf.weebly.com/uploads/1/3/5/3/135322240/2500499.pdf
    • http://abwaab.su/math_kangaroo_canada_2016_answersiebis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_132d5cc4115544759f99f600223b8e9f.pdf?index=true
    • https://s3.amazonaws.com/wonumafubij/how_to_use_denture_adhesive_powder.pdf
    • https://s3.amazonaws.com/ruzaganog/91488852938.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/europass_cv_template_greek.pdf
    • http://palexibibiw.atwebpages.com/6563353796.pdf
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_dcb49c798e5740fb92d1e8a05674f3c1.pdf?index=true
    • https://s3.amazonaws.com/xowasosuf/63910202477.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_off00013c22.bin
f6d31a8fdeff0f8ce6dee37f26499bccfe233991f75745b98d55cf65ed7d720c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C22 5468 bytes
font_01_sfnt_off00014ecb.bin
bc3e50b6c6d7eb9124b65a876aa1a75a803663e354522e8a9745d26735b076e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECB 11448 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.