Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bd3ec433eb551f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 13:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe862e67792bf4de8cf1bace52c16ba3 SHA-1: bea59c1aa8a21679116476fe1d9eef04ca1f5a72 SHA-256: 67bd3ec433eb551ff7a16015a8720bb27b4305f0226bea2150c3c533851aa26d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the nature of the heuristics and the high ML score point towards a phishing or malware distribution attempt, likely involving external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://suranareecommand.net/UserFiles/File/zasefabirexexiwut.pdf In PDF document text
    • http://kipia-nn.ru/userfiles/file/42629431943.pdfIn PDF document text
    • http://aa-nusd.jp/88865253702.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/86451395678.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/1444264731.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/javoseje.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/pezod.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/26358415512.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/27644899587.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/xidolofezapel.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/43874957992.pdfIn PDF document text
    • https://thepainter.asia/upload/files/timinosozarigotopafaf.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210906_054824.pdfIn PDF document text
    • https://datawire.gr/files/files/vatojilunaxazirenuleluw.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/72853256776.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/53100093745.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/majotoji.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/fixetakivuremoduvaropara.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/59564828981.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/tijisenufaxabaw.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/jadozeve.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/ginibejufojomux.pdfIn PDF document text
    • http://sacc-la-chaux-de-fonds.ch/fichiers/file/47347557312.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/purojumogixini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=components+of+instructional+objectives+pdfPDF 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_off0000c0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DB 16364 bytes
SHA-256: 8b8875ae7346b9b92f8294c6f7ce4b8e3505403b680245e1f5dc548cc2dba63b
font_01_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 11248 bytes
SHA-256: 7baf3a73cd6241b854be72d2521b6f56253cd834927ae66a22ef4798bb943d6d