Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ea675b7237e7bd…

MALICIOUS

PDF

84.5 KB Created: 2021-04-06 12:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edee28e90c61eefe474218a1398e2d8a SHA-1: 55666247655371cfa7f080850fdbd64fe362c867 SHA-256: 11ea675b7237e7bd40d6d8702f043cafd3e0996826e7ed5a5d35c7e807285532
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/aws?utm_term=un+curso+de+milagros+leccion+233
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/9344849.pdf
    • http://taxunijunor.iblogger.org/black_s_law_dictionary_10th_edition_download.pdf
    • http://repomaxisa.22web.org/job_contract_agreement.pdf
    • https://vutojakapejir.weebly.com/uploads/1/3/4/8/134895653/wuvosuzowiwi-pozavatasulural-rujuvija.pdf
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/9803697.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_4022d0d9b8694f10a840c2f18242039c.pdf?index=true
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_f1adbcbd1a5f4a8ca618f503141f646a.pdf?index=true
    • http://pukevekoba.rf.gd/guidewire_claimcenter_api.pdf
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_6b86e8016532456ebca57bdf797a0729.pdf?index=true
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_9d037c132982473fa7262f182851dc49.pdf?index=true
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_acea2af8d4444e2594ddd4f3f30372e5.pdf?index=true
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_425b829a7e88467c8f1639d7e8c43885.pdf?index=true
    • http://bovofekigigewij.rf.gd/10575611169.pdf
    • https://s3.amazonaws.com/fizup/dumarubuna.pdf
    • https://s3.amazonaws.com/xugigabitulu/82376208976.pdf
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_240214cfa4cc41c39ded5708b372ccd2.pdf?index=true
    • http://siroluga.epizy.com/volvo_bm_430_instruksjonsbok.pdf
    • http://vitusaw.rf.gd/word_document_quiz_template.pdf
    • http://jerananixakuzeb.epizy.com/how_long_do_subaru_2.5_engines_last.pdf
    • http://vonizevugopu.rf.gd/mecanismo_de_biela_manivela.pdf
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_fed1c36c853546c3846152d1fa552b3d.pdf?index=true
    • https://s3.amazonaws.com/gelawiweza/onclick_event_android_studio.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_off000108a4.bin
27147a3f9bff87ecd81093f070e5411ef9576f46a86729027ec50d3e9e3dda21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 5548 bytes
font_01_sfnt_off00011b69.bin
49e0b26fd957517f589d2d34f9a48450b1dfd604e2ec2956f5709f2e684efa92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 12288 bytes

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