Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40ebc1ea2946796…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 00:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 784648219fb6ee2e09ebfec124d5905d SHA-1: 3ad6962daff796304b42b21edf9c400d99ea1776 SHA-256: f40ebc1ea2946796a6a2683053bf3c91d7475b7cf192aeefdb8be6cb81aa4932
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The presence of 'utm_term=download android racing games apk' in one URL suggests a potential lure for users seeking specific content, which is then redirected to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9b7a2ec7---rukekikegirune.pdf In PDF document text
    • http://chi-kara.net/Upload/files/ferugepapajivo.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/ditatilokaret.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/17eb6a663ad8b0a600783ba753c6e101/55868461053.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/dozazevol.pdfIn PDF document text
    • http://showdoimovel.com/files/files/givotar.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/59413299665.pdfIn PDF document text
    • https://halead.com/uploadfile/1630700384.pdfIn PDF document text
    • https://wonkingchina.com/d/files/kepexudapavoxebavuwove.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/19b37a.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/pajemol.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/vizerewekivimuviture.pdfIn PDF document text
    • http://rococosofa.com/files/files/xazidarile.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/29664263778.pdfIn PDF document text
    • http://zaiger.ru/img/file/10519085429.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/89487639051.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/34005317317.pdfIn PDF document text
    • http://synergyproperty.com/images/files/kitun.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/gomari.pdfIn PDF document text
    • http://twilaw.com/files/files/vakal.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/vutuvagugisoke.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/tuzopafozazud.pdfIn PDF document text
    • http://hidramaco.com/files/files/45033283394.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/61112952771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+android+racing+games+apkPDF 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_off0000b9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C7 10940 bytes
SHA-256: 41d970a6c150b362a230f40cb1f18f96a9ff331d701a0aee95bc8556d16d21d5
font_01_sfnt_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 16900 bytes
SHA-256: b0dfdbdd17cc17328cd9cf9b2b84b66fef7120cf8a6c7b372a0a4f39e69b30eb
font_02_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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