Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e7765b2242c498…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 15:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a713c2d2e138b391db665fdd78742ed9 SHA-1: c4707b1e59dd2c7bb435f4d5c7a94645c318a02f SHA-256: 20e7765b2242c49827d3ad9729a2a9bc03376d6225adc9af811e1dba7f7f3e3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://papersacksfactory.ae/images/bulk_images/files/19662009785.pdf In PDF document text
    • http://giadinhlaurenso.org/upload/files/saravivi.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/lejokipilif.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ujapegiva.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/muxesifuxe.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/nakafevovugisako.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/3223995215.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161406757420d6---46448823526.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/945798241.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109231242593364.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/10775367512.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/lebazinifidiseka.pdfIn PDF document text
    • https://reha.bg/content/upload/file/butanixatarimen.pdfIn PDF document text
    • http://chromavials.com/d/files/66326581662.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/f6k5kal28n8jqtlfuutcshtapg/53137670894.pdfIn PDF document text
    • https://pitbulllocksmith.com/nbloom/fckuploads/file/wosukavizutaripedo.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/dololukupelurez.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/mijazusotuxuxemarene.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/61776004565.pdfIn PDF document text
    • http://eksternest.be/images/file/84113092629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cara+membuat+email+kantor+di+androidPDF 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_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 17240 bytes
SHA-256: c973efaf257576167fa6d91e29e73669fac948b9f5d677e734ca9e62cefcf747
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 10604 bytes
SHA-256: acf9ae9dcabcb06fc10ed52974e39b3b0fa1df3389338232d521a013c8564978

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