Malicious PDF — malware analysis report

Static analysis result for SHA-256 5383ae94c6e6a62e…

MALICIOUS

PDF

96.6 KB Created: 2021-03-31 00:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96197efb9baed34411885a336ae34674 SHA-1: 6bc3843f50335e36794db605514f72b9e7190449 SHA-256: 5383ae94c6e6a62e6da131e9800b392b55bdacc771667eb5d72281dd6ef085ac
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of multiple external URLs, including one flagged as unknown reputation, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=shark+tale+script+ss
    • http://wijasagasipode.getenjoyment.net/gekigugenuwuwavufuxa.pdf
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/3385307.pdf
    • http://lixorajepidil.mygamesonline.org/zmodo_camera_setup_troubleshooting.pdf
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/dapurefu_soputajanepoz.pdf
    • http://gikodarekegov.mywebcommunity.org/14785826297.pdf
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/1378123.pdf
    • http://pexulisinipev.sportsontheweb.net/how_to_repair_deltran_battery_tender.pdf
    • https://povominuvuz.weebly.com/uploads/1/3/5/9/135961678/xijepokegilakujudat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://baxudoxubalafe.epizy.com/amar_chitra_katha_complete_collection_free_download.pdf
    • http://livirava.atwebpages.com/mofemezalakomuxo.pdf
    • http://xerekexaxo.epizy.com/how_to_stop_huebsch_washer.pdf
    • https://s3.amazonaws.com/wixanarer/junorotilogefejidowedam.pdf
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_4688d934c8cb4054aca3ab95bca0f6e7.pdf?index=true
    • http://mudivakerimenog.epizy.com/free_email_bridal_shower_invitation_templates.pdf
    • http://bimivopi.epizy.com/21149705204.pdf
    • http://pazatirademe.rf.gd/deep_learning_chorale_prelude_questions_and_answers.pdf
    • https://s3.amazonaws.com/sizabo/20980999806.pdf
    • http://kesitebogi.epizy.com/9684190481.pdf
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_3d4e591de3ab45909a588491e4060652.pdf?index=true
    • http://dipijiz.epizy.com/freundliche_absage_angebot_formulieren.pdf
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_2d9baaf370204fd38b48f50e362d33e2.pdf?index=true
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_9db7cbee6c3342a0969bce00d5471015.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_off00013836.bin
b306433d6e62133dcea45de458b17f8d8cf8e9d77d9c5c10f4eda093d58b54db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 5188 bytes
font_01_sfnt_off000149d7.bin
8ed07573bdcd49504363aa21e30fed0889cb565903c6b6c04fbcd83126029159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149D7 14120 bytes

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