Malicious PDF — malware analysis report

Static analysis result for SHA-256 136c1e3dc5190d75…

MALICIOUS

PDF

68.4 KB Created: 2021-04-08 01:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9f37cf8ba8d0cbecfa0d7ca62e5ec66e SHA-1: 656a0de7ff1d969b6e03d1bc622486a50d09834f SHA-256: 136c1e3dc5190d75affb33ec79ff5a58d1d3787d4828244c5370895ad2bc6029
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to educational materials, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://leonvi.ru/wix?keyword=vocabulary+workshop+level+d+unit+2+answers PDF link annotation
    • http://zasufigonibat.getenjoyment.net/57925702865.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445333/normal_6045bc9cba5d1.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/1423078264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_60175c84bcad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_60593e76cfbed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_6062a9b70574e.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/the_ugly_duckling_story_for_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/rufomezin/bhVZZBn/playmemories_home_sony_download_deutsch_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_604cc9817f898.pdfIn PDF document text
    • http://pixujuxe.mypressonline.com/advanced_vocabulary_test_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nevowimo/shared_expenses_spreadsheet_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/53247803119.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/pdf_file_resize_i_love.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/89316069240.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/autocad_3d_all_commands_list.pdfIn PDF document text
    • http://xovojiga.epizy.com/37812961683.pdfIn PDF document text
    • http://muketatemeloj.epizy.com/what_is_energy_change_in_chemistry.pdfIn 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_off0000cdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 5716 bytes
SHA-256: 011310d70ba37ca19af1162f290226e7414b242c9dedcda99018a55e24b09e84
font_01_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 10152 bytes
SHA-256: 16e772ab42e92fd815cbabd7f8655dbfda34999f151735b6424fb9ec48f6be86

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