Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b7ef57135680e2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 07:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 788b16bb61ef9f4cbe83debf3bf3c654 SHA-1: 5b1b9edfda162978ea8dd63ed6769e3d0273151e SHA-256: e9b7ef57135680e2d6707788f14667ac49e06a89961c53dcf52ca8beee16bdf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs that point to external sites, many of which are structured as link farms. The presence of 'utm_term' parameters suggests a phishing or tracking motive, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://coretry.ru/uplcv?utm_term=home+alone+2+gomovies PDF link annotation
    • http://giaexploring.it/userfiles/files/85286457879.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/76326447878.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/lamuxisadozejiwafidavo.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zekanixirodoranezer.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/72168020574.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/70073734012.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/16168615182.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/30162270061.pdfIn PDF document text
    • http://abwva.com/uploads/files/76026719612.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kifakepixorepobilu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53bee9118---18650093369.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_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 17444 bytes
SHA-256: 4ec21242a3ca8b7ce990dd8e5e23807eedc207ed25f6a1435b2f927f6a9288e7
font_02_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 10432 bytes
SHA-256: 3b48f1ca82c1d24650287cb8533b393ccd7870f6bb46972e6c60b1308dbafbcb

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