Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4268b12db6cc607…

MALICIOUS

PDF

79.6 KB Created: 2021-03-24 20:25:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c274339ecd9b9f138ff20387c7bb88e SHA-1: b9bbbaded2c1136a213867f4f10a1442fca44934 SHA-256: d4268b12db6cc6076cb8077485f2c1fb58d03b0920e82c0bcb11afdcaef8f302
96 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • 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://botokaw.ru/wix?keyword=ionic+bonding+and+chemical+formulas+worksheet+answers
    • https://pebujekug.weebly.com/uploads/1/3/4/3/134380671/3855958.pdf
    • http://securespot.ru/15557120557vzjmi.pdf
    • http://nubolats.xyz/guitar_scales_for_beginnersvoz8u.pdf
    • https://cdn.sqhk.co/kerodamajop/N8hjji4/conjunctions_worksheets_with_answers_for_class_8.pdf
    • https://cdn-cms.f-static.net/uploads/4468255/normal_6011655f7b3b1.pdf
    • http://ogranifruit.space/subordinating_conjunctions_worksheets_with_answer_keywppwn.pdf
    • http://ersoil.fun/3694771667799hft.pdf
    • https://weligolujevis.weebly.com/uploads/1/3/4/7/134748453/6a9735bb.pdf
    • https://cdn.sqhk.co/ranemagesoga/LVEGpge/31744518663.pdf
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/lisuzo.pdf
    • http://beststudent.fun/rorudikowitapenilojapzg9k.pdf
    • https://cdn-cms.f-static.net/uploads/4374198/normal_603d49f5693b0.pdf
    • https://tuxakosubulep.weebly.com/uploads/1/3/4/0/134012578/zumimomido-rupupisiga-difasajokizolaj.pdf
    • https://cdn.sqhk.co/wujakegu/ijigeHP/make_a_unique_list_in_java.pdf
    • https://nimimemuxigu.weebly.com/uploads/1/3/4/4/134488465/53af5ad4e10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/188c0f3b-cc8d-49e9-bc67-49848e6384fe/43589757447.pdf
    • https://uploads.strikinglycdn.com/files/2d8e4e68-a9e0-4853-8584-bac1102d5361/womusefamuduveka.pdf
    • https://uploads.strikinglycdn.com/files/803e6f5b-c52d-4533-9682-2d7a6ec85ee1/lutedezut.pdf
    • https://uploads.strikinglycdn.com/files/2bfd37b3-dbcf-4c13-9102-cd0621548c2b/lectura_de_los_niveles_inferencial_crtico_e_interpretativo_crtico.pdf
    • https://uploads.strikinglycdn.com/files/47f2029e-974d-4fc2-985e-ef4d513bbeb4/vocabulary_test_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/2faf9a36-6d7c-413e-8fff-fc17e4a5bdf8/21835031104.pdf
    • https://uploads.strikinglycdn.com/files/3322db4c-4255-474a-af94-cae5c33453d1/xufipoxojabujadevepewo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6d.bin
f1c9f6e35062cf02d4d5db47ad2093ff50664611a5a5be26c7157a521c868f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 5552 bytes
font_01_sfnt_off0000fd26.bin
4119e69b47f64adec7a81dae84400129c6b61fd3f9027e5d971c9acea33c82ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 10920 bytes
font_02_sfnt_off00012296.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 4324 bytes

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