Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccacd974353df3f…

MALICIOUS

PDF

89.0 KB Created: 2021-09-15 11:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c53ca307c1dfb4acd16cd649ea3e096 SHA-1: 9521ace8b6b4b9e80e9a32d8d49992d5a7ecd473 SHA-256: eccacd974353df3f2fe7f12245e42c9c745ac67a71bf8a722b7984a58ec52b2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of multiple external links suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://infrive.ru/uplcv?utm_term=mario+kart+wii+emulator+download PDF link annotation
    • https://rzfmuhasebe.com/userfiles/file/jimaviru.pdfIn PDF document text
    • http://dkind.net/userData/board/file/gomove.pdfIn PDF document text
    • http://irollee.com/userfiles/file/37528880583.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/zabodabugidadovumojosota.pdfIn PDF document text
    • https://egca.fr/userfiles/file/nesuzorofowapedoze.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/62724253162.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b5231712f4f0f95ff368b0c2cc37645c/18532479112.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/63303422684.pdfIn PDF document text
    • http://czyxchem.com/upload/files/kibaf.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/72000501443.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/nidal.pdfIn PDF document text
    • http://195exim.com/datas/files/lusekajatiloserura.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/girefeturovi.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/98755622226.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/jitureriwanadezonaje.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/vavom.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/javifoduxowekiworawaku.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/63258709696.pdfIn PDF document text
    • https://hinaweb.com/upload/file/89638676914.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/93540604152.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/27890638043.pdfIn PDF document text
    • http://soles2walk.cz/data/file/61115749134.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/66164387582.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210901/files/20210901195948.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 17660 bytes
SHA-256: 0674c6411d945a791997d982166f50e2bde164770b20b69fbd8d759284bad70e
font_02_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 10512 bytes
SHA-256: f6dcfd77ac08adf381875f081b7210a491bb41dadf6282a132e62eb00a16f711
font_03_sfnt_off00012933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 17220 bytes
SHA-256: c02d18d56635992a05cffe873a3209938ee317ebec49d4ae10e95387ccddb633

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