Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecb4b54def87a18…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 21:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1042bbe1ac235ec97a0624b8f7bd3456 SHA-1: 9f7b6a358e458b2e2d66dcbe98ea0f85d1f0d3fc SHA-256: 4ecb4b54def87a18be10aae49dc09b4aeb1c81f1bb624c1fa82f9672fe6d9cc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs indicate an attempt to direct the user to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=moviesda+2021+movies+download PDF link annotation
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/86457314101.pdfIn PDF document text
    • http://marketingnews.fr/images/file/49030245513.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/lemelufevujopegitoro.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/8658224495.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/83671999830.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/sovutipi.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/figapusigobo.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/gitajefulorebenav.pdfIn PDF document text
    • http://bdata.vn/upload/files/15895330739.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/46912835948.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/88138772075.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/revuaqse2ur58p8ccivl3cfibv/guwuvo.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/pinenomarigido.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8bcdc137---17879681660.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/72528076211.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/sebulipunukuriwivalitu.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/59245086682.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zidawirinalopibot.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/bufitunize.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/fakotur.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/rumafovavitoterekapimot.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/batujen.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://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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 10648 bytes
SHA-256: b67425a9952463734ccf1ca11c5b18a9d9de77fe570c1c72b9d28a77b6baba80
font_01_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 17924 bytes
SHA-256: f9ae3c4f770de72a857fcf2a4bcbe6fba52dbba9e427e91834f81e5c4fc8443e
font_02_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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