Malicious PDF — malware analysis report

Static analysis result for SHA-256 b484c26da8cc7ba9…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 02:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dee0968108ea2c156c8fa2c1721cbeec SHA-1: 4aee40aca21425623b6509e38446a1fa412b68c2 SHA-256: b484c26da8cc7ba917b17c10a0156204dfae1052c7bb7986f1b1ca3b7d95ad46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It functions as a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://memo-log.com/userfiles/file/livakemagakes.pdf In PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/7208072876.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/nuxegadafexizanolikov.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/polemazefivufe.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/8047816982.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gobokugelibibusesapari.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/85863373905.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/sitosuxil.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109050216201592.pdfIn PDF document text
    • https://codecs.ro/images/file/sirugekarapow.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/65545517276.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/8crosjl9v65g72jkgdngvrnvu1/42586492374.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210910124524.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wasuluzogupitami.pdfIn PDF document text
    • http://jonme.net/ckupload/files/87886258116.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/60836980249.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210903115053.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/66847428083.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/8829501129.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/89544340705.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/kixidovowoloxoragez.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/tadetesi.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/29465543834.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/10519770813.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c15ba4249---nidadalavix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+and+install+xeplayer+android+emulatorPDF 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_off0000c142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 10956 bytes
SHA-256: 4bde68f9e0f5f6360b90d6441b20f87c7db75105134dc57c0040522bcfcdd014
font_02_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16800 bytes
SHA-256: ecffb8a671f641bde3ab68bd3f46c911764cec1dfc73803631f5a641fbd1b59c