Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4530d3d16f2b21…

MALICIOUS

PDF

90.8 KB Created: 2021-09-17 17:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 64753c3b9b94e689cbbf8e8af108176f SHA-1: e2ee9c1489f8b39789076dcebf9a5fc4d02003ae SHA-256: 9b4530d3d16f2b219a90fe4134a5b751202499e1c06d7231caf25f0dcf79462b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of external URIs, many of which point to potentially disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zbmbudomont.pl/userfiles/file/lulezixifowipukamali.pdf In PDF document text
    • http://ottomaniantextile.com/userfiles/file/magetujusuturiwaluxisox.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/71988105817.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/puxonufasomije.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210916074749.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/29355630932.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/munavav.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/48319228825.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/53794284890.pdfIn PDF document text
    • http://446888.top/userfiles/file/xexupuxe.pdfIn PDF document text
    • http://potlista.com/file/files/kaxit.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/48706484947.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/wiwitosulawefiruvaw.pdfIn PDF document text
    • http://partnercable.com/files/zigopevazabagipoluzufeb.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jatejufugojinesazesis.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/wonototele.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/migeriwupatatireroliz.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/71446495873.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/99049462662.pdfIn PDF document text
    • http://nenorm.com/files/files/936727254.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/gosejupixokawomupofi.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/41110883511.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/81175709237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+go+ditto+hackPDF 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_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 19656 bytes
SHA-256: 4c8126f4b8372950e6259732563d963b7c2f74f50dba0d5c4ab04137390cd976
font_01_sfnt_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001466f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466F 10596 bytes
SHA-256: 3a801266caf12b0d800749299eee07dd074f82a246ad3ce5a00db219eb96d8a4

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