Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee4aa1c23d05504…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 19:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 910a8e6891c6c6dac1b9edb6db54fda4 SHA-1: 58f67816c4077725ba4b643e3bdaeefe2c53a505 SHA-256: aee4aa1c23d055043a9177871312b1661bdb0b0e57a58a34d8def5871b3b9159
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, likely to distribute phishing content or further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://scout-educationguide.com/userfiles/file/33399342974.pdf In PDF document text
    • https://cubic.is/userfiles/file/29614628856.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/57947175346.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/rujinafupuzovul.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/11272156019.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/43769485310.pdfIn PDF document text
    • http://pb-book.com/user_file/file/68484298560.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/wawodavujijeluzomuzek.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/jusen.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/04e4483bdbdb94bd9e3df6c3a0b71a4b/41054462523.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109130123235763.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8f2f9c1131389bf9a9517de649ef2023/fejob.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/gekobakudi.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/gutejobo.pdfIn PDF document text
    • http://keramann.ru/uploads/files/27330635944.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/bexovofe.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/45411741283.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/63105354830.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/43520046559.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/pusezikinejuganajit.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/74009138742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mc+5+mod+apkPDF 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_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 17864 bytes
SHA-256: 0b371c9d9dce96c71b2284c69f186854f14d9eb1d8c240170192c133cfb56bc0
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10152 bytes
SHA-256: 72f2f3892181863ea3eff7d518c1781eac2c59478cdd4d9e96d6cf839593e72c
font_02_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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