Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b518385d27246b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 00:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2f4aa2df46ed659eed818863c2557e5 SHA-1: 777e302b7c604a173c302524379c6d9eae97fc1b SHA-256: 96b518385d27246b036b6b9d4ebb44ec19d55faf7265a2d9ec20874667f2add6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a structure designed for SEO manipulation and potentially distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://splhardware.com/UploadFile/file/2021090423223873499.pdf In PDF document text
    • https://easypayindia.in/userfiles/file/ravopisuzat.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613468b815021---62483101337.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90780692640.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/lolejaxokawo.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/64516173815.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/melazawamu.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/runafa.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gotikefagubixebetuwevali.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/samikadikarodoximetivulo.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/kilotugafevakalidagefi.pdfIn PDF document text
    • https://kaparatt.com/images/File/dusakubadibivatemibos.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3mni359nc9rl24199m33kn7mld/jigada.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/97937143851.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/xilijakixidudop.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/gimadezuj.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/25338807647.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/62414084069.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93e6ddf00---95518172553.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/90873027175.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/jumofotisoronidabufopek.pdfIn PDF document text
    • https://hot-pol.com/images/file/78456851204.pdfIn PDF document text
    • http://rapet.hu/files/19156517949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+watch+free+live+tv+on+android+tvPDF 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_off0000b655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 10548 bytes
SHA-256: 1fa7cab397dce2e92ee3d4669dbcf781da2c1a3b8428f59c7febfaab643fc834
font_02_sfnt_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 16520 bytes
SHA-256: 16e18cc2e207c8983fff486b7293faf88d72a88f6c8905490a2ee316f40ee3d3

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