Malicious PDF — malware analysis report

Static analysis result for SHA-256 3462d1cba27f7e20…

MALICIOUS

PDF

84.9 KB Created: 2021-03-15 09:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c418a431c9e9019afae0f455ec3c030 SHA-1: 6d9514ce984781124112b83464664dd4a4c5e96e SHA-256: 3462d1cba27f7e20c478879ee2860cdcb6ad4ab10c683710f042159c39ae3ee0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/wix?keyword=violin+sheet+music+book+pdf PDF link annotation
    • http://sq11mini.com/wordly_wise_3000_book_5_lesson_5_testcr1ca.pdfIn PDF document text
    • https://tifixexeruwa.weebly.com/uploads/1/3/2/6/132682204/zubeg_renaz_fasepat.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/jfcLlhb/accuradio_most_oldies.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/bcIAxig/sosugokirupisif.pdfIn PDF document text
    • https://vatikaleme.weebly.com/uploads/1/3/5/3/135386674/jemujat.pdfIn PDF document text
    • http://dfwshootersupply.com/68658672286plffd.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/26238004127.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/fiduvuruwi.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/skyjack_scissor_lift_brake_wont_release.pdfIn PDF document text
    • http://modernstyle.pro/dr_jekyll_and_mr_hyde_movie_2008_streamingb7pdt.pdfIn PDF document text
    • https://zizudenavoxe.weebly.com/uploads/1/3/4/0/134017195/fuvuxo.pdfIn PDF document text
    • https://binujoxejixisov.weebly.com/uploads/1/3/4/1/134108892/476747a1fbb76b4.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/22714412413.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxibovesiva/9jgjeih/asvab_science_study_guide.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/ill_see_you_in_my_dreams_chords_chet_atkins.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/b8221e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_4679ce73adcf4dfba574de38f43fd1ce.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_43d36c9cd3ec4477b2c7a8f4b9dfb26b.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_258748b9ffbb42c6bb208c696db6c5b0.pdf?index=trueIn PDF document text
    • http://mojozore.myartsonline.com/how_do_i_see_my_pc_specs_windows_7.pdfIn PDF document text
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_ed12b8273efc4a438396ab79c5d14833.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_2477346d2a3c4916acc406799d3c5ceb.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 5260 bytes
SHA-256: e7d00f70b71ec4f65bb092ef8341e9ec7bbfb624b0e31f680b88c696bad2f69e
font_01_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 12604 bytes
SHA-256: b46e71531aa472f7668e41eb0035bf4756d83285af076c4d23b6c79e9d30c395