Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78ce90deab48d41…

MALICIOUS

PDF

81.5 KB Created: 2021-03-20 17:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3f301b188a74576885a9573bb33195bf SHA-1: 1092ef6efb90349e505b49d39669a0c55ae96059 SHA-256: c78ce90deab48d41c616bc1c8fbe740c2b9f3009f640f6f28716d592a590a756
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 0.9992

Heuristics 5

  • 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 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://zajinet.ru/wix?keyword=recipe+book+cover+ideas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422909/normal_60434770491fb.pdfIn PDF document text
    • http://wugulisagu.iblogger.org/learn_arabic_application_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_600a124b2e212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426686/normal_5ffaeadf76107.pdfIn PDF document text
    • http://duzodukigesutif.iblogger.org/figuxiwesaj.pdfIn PDF document text
    • http://characduwe.space/edexcel_textbook_answers_physicsyjr8n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464302/normal_5fed12cb9f860.pdfIn PDF document text
    • http://lozaratoz.iblogger.org/13169373438.pdfIn PDF document text
    • http://bapitafi.22web.org/witatupajujabupox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_6023024a6d648.pdfIn PDF document text
    • http://kprovk.xyz/venn_diagram_of_microsoft_word_excel_and_powerpointla3w4.pdfIn PDF document text
    • http://powujamoxeji.iblogger.org/vufomilunafakabaled.pdfIn PDF document text
    • http://scm03.ru/fishing_guide_stardew_valleyxpp77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fc572921c135.pdfIn PDF document text
    • http://kekebum.22web.org/taladowel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_5ff680e1be8fa.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/gofilafixu/black_and_tan_piebald_dachshund_puppies_for_sale.pdfIn PDF document text
    • http://nunejodututote.epizy.com/jaxaxogivawabezali.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/marketing_exam_questions_and_answers_2018.pdfIn PDF document text
    • http://zipaluzit.rf.gd/fudiloxutifijutom.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/37381553148.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/vunadonepolopuvikejidoz.pdfIn PDF document text
    • http://bumufir.rf.gd/best_background_editing_apps_for_android.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_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 5304 bytes
SHA-256: 2838cd81ec93d5e9542ae0968c2fadc6e1e646aed51982213a48f5ec52aeb963
font_01_sfnt_off0001141c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141C 10652 bytes
SHA-256: 395796efd12043f3a4d92af140494ca16032f296676b7bdbc65983b5859f4edf

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