Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89d5bc20e8c145d…

MALICIOUS

PDF

65.2 KB Created: 2020-12-06 14:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d9f8b90a19e05566a57834abc326765c SHA-1: dec8be5706307a119763d98ae4ac2c6a0867455e SHA-256: f89d5bc20e8c145d4bdaa493279635d58bf78c02a67c7cd6bc850171b540fd34
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://traffine.ru/123?utm_term=zoom+by+istvan+banyai+pdf PDF link annotation
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/5efd161da79c2.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/1e5b8ecf07a1a.pdfIn PDF document text
    • https://mikodetakono.weebly.com/uploads/1/3/4/4/134497144/ludipikowuganexug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fc629aa4473e.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/2a385f2e66699.pdfIn PDF document text
    • https://wumevevevusawu.weebly.com/uploads/1/3/4/3/134388399/kuwajareti_latele.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/memul/sociolinguistics_an_introduction_to_language_and_society_trudgill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1572ca6-b347-493a-a5f1-4988a6495e70/pikinazifunexalekasexemup.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/kopoxasezisuvosuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17ec8b5-be5e-4e6a-80cc-7c11953b2101/pathfinder_kingmaker_eldritch_knight_build.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/general_knowledge_quiz_questions_and_answers_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4354032-acb8-4b47-8905-9a58c7cff057/bonaxefugugonin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52722339-633b-4cf5-8100-274c12e22b76/82441594936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82691281-3709-4aa9-a14a-8c195d557d71/63781052759.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_off0000bff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 5316 bytes
SHA-256: aeee3b9a19224b18e901d9007146e6fea82b26c969c8365e92f3f0c8dce57f48
font_01_sfnt_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 11168 bytes
SHA-256: 4de2fbdfa565f11635877f9764c9d4a6111a13d84dc9a4c06a18053802b9eb03

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