Malicious PDF — malware analysis report

Static analysis result for SHA-256 e181cc11fb740c35…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 09:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1702fb3cf3de105e778e1f45a60c890 SHA-1: 747bb3320db8a137b3b93e078152f556219e9e21 SHA-256: e181cc11fb740c3599a1669cfa9e0dc20e6c8f60c727992da67a86ae0615759a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest the document is intended to lead users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://cructi.ru/uplcv?utm_term=download+instagram+video+and+reels PDF link annotation
    • https://gemicilojistik.com/userfiles/upload/file/32677671962.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/56503206672.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///977499735.pdfIn PDF document text
    • http://banquat.com/userfiles/files/55758051410.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/buferijegusatipujifesop.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/tewinezikemukufis.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/relaw.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/tixamepapufem.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/93399432871.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/zitiruxajogev.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/gadezokawemukikufirekawe.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/vositegugomut.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/89374987268.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/34502246944.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/83031399181.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/79841019521.pdfIn PDF document text
    • http://www.pvvc.cz/files/83120305237.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/36391268622.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kipinalobimoxojuzajuma.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a68ed4eda2f8eccd53eabc9736b522ba/limarakujiwufezabagipeb.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/21688601723.pdfIn PDF document text
    • https://davaocarrental.com/images/file/beneno.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/11565994209.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_off0000ce72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 10744 bytes
SHA-256: 959dca562a36fd8f4e79a64b78659c223e23f3cca56fb2c250671616aafc2b01
font_01_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 17816 bytes
SHA-256: dbdc5346be77276cf4d3bfc9276af43ded9dfb875c04795796d6a8fc195469db
font_02_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1