Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2861d96fb04906…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 20:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ce2f976e3ac1d1aa63fe6897e57ce5d4 SHA-1: fe389450f788f731baf228c3945c5eb9db72bb3f SHA-256: 4d2861d96fb04906fe3f124ed5b1c61886aa585dbf1de2e6514158b8b4207d61
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains an urgency lure and is part of a link farm hosted on disposable domains. While no scripts were directly extracted, the PDF structure and malicious classification suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://rachelrom.com/rescontent/file/lutilanux.pdf In PDF document text
    • https://pindimana.in/uploads/file/36947620135.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/20308776417.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/zukuwomiroseje.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/gejanofolisusezadixune.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/80248955571.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/2741511710.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/zidunuzador.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/56882460702.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/31637548182.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/miwamapukisonawomuwupanej.pdfIn PDF document text
    • http://iltorg.ru/upload/file/desam.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/35977119867.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/rareruzuf.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/57375430100.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/gunopukenizizowe.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/92538883598.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/biloxavona.pdfIn PDF document text
    • http://www.depomatrial.com/file/nibejujebuwatokedufejero.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/xeridemukuwanoxugovep.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210905_6D236072CDB24D88.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/nogovuraz.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210903_CFB46BEC0DDF8BA5.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/36112759078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=app+tengok+animePDF link annotation
    • 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://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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 17968 bytes
SHA-256: 0bffec37d2dcc350f78f9c7d04e1b00f1527714a3681c0d905872bb172b21279
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 10352 bytes
SHA-256: f36d69e2fae5f1cdc3bbf91904ebd2e00811855e0aed68e09bef9fb1278cd1db

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