Malicious PDF — malware analysis report

Static analysis result for SHA-256 045feebacca38e0b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-13 17:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5da8fe428d98b5275bf5b8b573f01a6 SHA-1: 5a004a038350e2d87299fcb6ada965b875e78fbf SHA-256: 045feebacca38e0b81b4b28274fd24529b22199283de98bb1cef99337fe742ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=what+is+klms+agent+on+my+android+phone PDF link annotation
    • http://samocvet.org/foto/ck/files/40040097535.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/45438410315.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090416003494.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/45369543118.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/62243236520.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/pulotaxilaven.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161306dbb813fb---nunazavomutazuvajegunemiv.pdfIn PDF document text
    • http://fourfoods.com/images/files/93270622924.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/57955093211.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vurozugo.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/duralebu.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/56696068374.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/84698218538.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/xabamem.pdfIn PDF document text
    • https://majubesar.net/contents/files/lomuvufododigorizaz.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/33832573412.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-8/20210908020000242508.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/wepogajudajunepupibufob.pdfIn PDF document text
    • https://maviet.vn/upload/files/17824393495.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/59145499988.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/pifezosugoki.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/75388983041.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/vamidu.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/87636363435.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/99540110353.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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 11036 bytes
SHA-256: 59b0e245ce84b87ced4f77724d98e3d5a169ee7b67b9a8c5b8e8906eecb52137
font_02_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 17620 bytes
SHA-256: 93c3cb4d2071418ced88e62638da5798717c421794b21feddf4aeb7adf2b9c5a

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