Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b80790619b4d209…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 12:24:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3be96b46945584409fe6c8df34c44408 SHA-1: 9ddcf03e088c0b4bbf6167c88986554c09c767db SHA-256: 5b80790619b4d209d20d782929569136863c3552894592cbcbf8c7bc5c1b0b6b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://dugedepap.ru/strik?utm_term=sistema+politico+mexicano+mapa+mental PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5ffe7995b665a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_600de67cae4e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_6049c04b01a0a.pdfIn PDF document text
    • http://sewonmedix.ru/46091587353m4l7l.pdfIn PDF document text
    • http://biggymstoe.com/green_bubble_menug1p68.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/arteritis_de_celulas_gigantes_2020.pdfIn PDF document text
    • http://tazidufobosefi.iblogger.org/caballo_de_troya_9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_601b2e217bd7d.pdfIn PDF document text
    • http://gutudixob.iblogger.org/mozilla_firefox_app_for_windows_8.pdfIn PDF document text
    • http://tagepalalog.iblogger.org/tovamobeganejuretu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_601367bd4fa5d.pdfIn PDF document text
    • http://chategratis.online/132330615949q9xv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/70612205290.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_5eaff1e0472a413799a2410c69b391df.pdf?index=trueIn PDF document text
    • http://kapudezab.rf.gd/how_do_i_turn_on_my_smart_wristband.pdfIn PDF document text
    • http://vuwejamadadodi.epizy.com/citizenship_test_questions_and_answers_2019.pdfIn PDF document text
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_497ce02baaef494bbc02b18dbc37ef44.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_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 5152 bytes
SHA-256: b5caa8bb69b47a71addbb8e687005f2253728e8677aa5488cde8a150975b1137
font_01_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 12364 bytes
SHA-256: 840b60996ad96a9f4ec05ab86aecf74e464a67c32c2358eb21ce705540e83718

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