Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a54c2faaf6765f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-23 06:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f607248838eb3ba5eb29423f3f2d7c1e SHA-1: 086a7deb305e015ffb328cf28573dd104cb111c6 SHA-256: 12a54c2faaf6765f72a11e5f790ef6368d19701736a0406a8f654e4a2154e189
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 0.9996

Heuristics 6

  • 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 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://zajinet.ru/award?keyword=agamemnon+lattimore+pdf PDF link annotation
    • http://kazexajisodibu.medianewsonline.com/77542554679.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/bjjiAji/63747522993.pdfIn PDF document text
    • https://cdn.sqhk.co/dusawugivepo/7gieiiE/72116938978.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/Ahh6gjI/9th_grade_math_review.pdfIn PDF document text
    • http://item-mask.top/674279507191jywb.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/acordes_guitarra_descargar.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/convert_file_to_microsoft_word_document.pdfIn PDF document text
    • http://tryadasert.online/kaseja5wami.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/3NGjhjf/mexemudotikililenufeba.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/dnzq5hj/79921567455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finubovuputok.epizy.com/axel_f_piano_easy_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95d2e14-a599-4ff2-bb1f-4b069565e8cc/painting_easel_amazon_uk.pdfIn PDF document text
    • http://vaxutere.rf.gd/joniketolelim.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/cisco_sg300_default_setup.pdfIn PDF document text
    • http://guxajez.rf.gd/61980567829.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_39852f8351b8440fb9c5e096a29cdefc.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_516c2b7db42648c2a8c231c6dedaccfd.pdf?index=trueIn PDF document text
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_14386c35cf2a46be9e28501d1d23cc58.pdf?index=trueIn PDF document text
    • http://mowesedapi.epizy.com/xofaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c6f923-3ff8-4fa2-a854-08d3aa29533d/kipofowenigel.pdfIn PDF document text
    • http://xugadizedema.rf.gd/effective_speaking_skills.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_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 5172 bytes
SHA-256: 4018ef2323645e9cb8e0caf8bb7a22f8343f44c7bcc5dc8706bd2cb674090d26
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 10548 bytes
SHA-256: 719e0d19d0905ecd378d992234f8932c3aee00a54efc269fdb488545c0df6bf3

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