Malicious PDF — malware analysis report

Static analysis result for SHA-256 30514eca3bab63a5…

MALICIOUS

PDF

89.9 KB Created: 2021-09-13 04:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b821217aed259727e7ecc87d7c4a6e2 SHA-1: e9a1ec869a76890a59deb753e5a49ce8014d0192 SHA-256: 30514eca3bab63a563e6885ed6e672861fda286249fd17ebd049381f0520afd4
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 trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing. While no scripts were explicitly extracted, the nature of link farms suggests an intent to redirect users to malicious sites, likely involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://longarmquiltingacadamy.com/fckeditor/userfiles/file/risugajokesakejulu.pdf In PDF document text
    • http://cerrutistudio.eu/userfiles/files/76571976916.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/77728170947.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/vipanonunudadotegixusobi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/temabalumosapezupokega.pdfIn PDF document text
    • https://phr4u.com/files/lakazevenabibotunib.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58102560286.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/bugidaludawiroxuguvib.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/88502158404.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/47346747262.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/bematakomuzatarodin.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/dixuzog.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/1796419170.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/37316962359.pdfIn PDF document text
    • http://elsped.hu/files/file/86426842079.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/36928878578.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/8508945907.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139d0d99db---jalatotexixe.pdfIn PDF document text
    • https://stotex.rs/files/mefikasapupopovukewejixu.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/nufajuvokewaz.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630768586.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/tasivinowusoraresal.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/70062982756.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/28455056837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=index+of+lost+season+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013eda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13EDA 17628 bytes
SHA-256: b7da12d9373bc114cd8098d0646e25f542fcb26ddf522b45f79336549f16a253
font_00_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 10344 bytes
SHA-256: 32551cd25ee852c4806ba402adb1a82a5647ecc158e67fec9b6868db59063b64
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 17004 bytes
SHA-256: f2c3ffff7e77a26e5cd7bfea3112ecd3938d7f752e20872795f5fb8e15d5d3a2