Malicious PDF — malware analysis report

Static analysis result for SHA-256 2388276dda6cf9a8…

MALICIOUS

PDF

79.9 KB Created: 2021-05-13 11:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ce771c1925c25f5ae168970c2e17c060 SHA-1: 766efcbd908705962c53297dd3415ffc82d69e9a SHA-256: 2388276dda6cf9a803544fd982a784d0fae84ce1f09766940429e8bcc7df33d5
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://xajibur.ru/strik?utm_term=gardening+merit+badge+workbook+pdf PDF link annotation
    • http://belixawotid.66ghz.com/anne_rice_sleeping_beauty_audiobook.pdfIn PDF document text
    • https://rezomiwutamanap.weebly.com/uploads/1/3/4/3/134362688/zesetogavupape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486354/normal_603e281f35b19.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/73466620441.pdfIn PDF document text
    • http://dexuposi.sportsontheweb.net/shell_scripting_commands.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_604cdd007c9f4.pdfIn PDF document text
    • http://rajajime.mypressonline.com/66821470218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_604f97b7302d0.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/kobaxedafojasu.pdfIn PDF document text
    • http://pakizimavom.scienceontheweb.net/gogepilixawefabalax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_602823513d4b0.pdfIn PDF document text
    • https://kapebuzuzevasa.weebly.com/uploads/1/3/4/5/134587117/mufapa.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/application_letter_for_scholarship_financial_assistance.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/pevuwarobuvowa/white_crepe_paper_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/half_sleeve_tattoo_template.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/zunekafoxija.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/6465660324.pdfIn PDF document text
    • http://ligumawi.epizy.com/bollywood_movie_sites_top_10.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 5480 bytes
SHA-256: 0486b6c99661ea831100fac20efc6b2015eee76dfe54613b65a532136c214abc
font_01_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 11372 bytes
SHA-256: c7d22b1c73d78868c6f76ac241f2e15462034594aff4fc780ad4c5e8ffdf0732
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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