Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5aeee01d4ba64cc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 04:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ea21da3f88be8b7348fa1a8b775becda SHA-1: 1da76544df2e0a2d4389f587417fd70fa85d5095 SHA-256: d5aeee01d4ba64ccf17e35bb2afc04b08cd7128b27d20a8477cc0de72e9d1b31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://eminenceconstruction.ca/viking1/uploads/files/74461918792.pdf In PDF document text
    • http://cautrucpalang.vn/webroot/img/files/tovigafozixufajiwuzuburi.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///35437265104.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/58712261233.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/kixet.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/xepuw.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/4637796282.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a42fb128b---75536604471.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/muvelalimubafegebaluj.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/oal0o7fjcdud8ul9jh77rlvvg4/14199872169.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/lobet.pdfIn PDF document text
    • http://umhouses.com/uploads/files/pojizoliwusugafutaxup.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210911_FBB56AEFE8189CE7.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109221959089919.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/4596075730.pdfIn PDF document text
    • http://119pump.net/d/files/nasob.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/fazaxabovulo.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630766731.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/32976342428.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/82141483592.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bajofamar.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/89136440322.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/zoxopeturajo.pdfIn PDF document text
    • http://zerosquareonline.com/file/zonazeriwakar.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/23661820343.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/womilenigugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+oyun+y%C3%BCklenemedi+hatas%C4%B1PDF 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_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 11040 bytes
SHA-256: 52290ae0cd8718dc216ea929f3c8165c47d0f2f99c4358729edc4e79d61ecbb7
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 17888 bytes
SHA-256: b338ddd2a7ea294688dfe337bc1ee862ff87180da3e53c6cd418be11b2edbb9c