Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb476ea0e0c3719…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 11:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95e335e27dfd03bf208b6937eba69e57 SHA-1: fc788a8b3c144f0ab3fe3ca38f3e99e57649fcd0 SHA-256: 9eb476ea0e0c3719f8d17eeb2db20332678cbd3213bd04ed3b996b79f50b5d8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://electroagro.es/pub/files/24559050883.pdf In PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/97174894597.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109051350364066.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/jibobex.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109020919463261.pdfIn PDF document text
    • https://panoramabyty.cz/content/lukifafubogapapod.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/bakabopugudebaza.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/179be8602ee054677d2937995fde4be5.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/zajujufejotuxarixatowexuz.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/gupupowisipawalimoxaz.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/96007675761.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nuwabumanifaset.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/doxekizirajafeweje.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/somoxunatiw.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/55438959999.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/55158980211.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/870505209.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/nazoramibovefuxidux.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/devodagewakuvi.pdfIn PDF document text
    • https://olterus.info/contents/files/38963468325.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/94911293527.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wases.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613114048937e---kilixesebepagesifivire.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/79483840940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=old+cat+dozerPDF link annotation
    • 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 17300 bytes
SHA-256: 942db841d03a8f52f41cb688df17a74b41c002a08ac8ed3c14ee03d83d893320
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10084 bytes
SHA-256: 66c593d934eeef20b6b6ad0b4c2ee4e1bba76dae6ebacef7718e9f52ab4cee07
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1