Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3c40550ba7b9c5…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 10:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6acc8c269f58b0d9cd33a772b3672771 SHA-1: 49a00785bd2ee83694d4a861e62d59bec201a18a SHA-256: 2d3c40550ba7b9c5dad225f765671ad56292d82139fbf1151e0282dc4b2218c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm on disposable hosting, with numerous external URIs pointing to PDF files. The embedded JavaScript likely serves to exploit vulnerabilities or redirect the user to malicious sites, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tuecpa.com/file_media/file_image/file/19767442836.pdf In PDF document text
    • http://stauarchitetti.eu/userfiles/files/lasapagobofutujobotunopal.pdfIn PDF document text
    • https://dienmayngalinh.com/img/files/mefezojorofaguma.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/gunewimimup.pdfIn PDF document text
    • http://venkateshservices.com/uploads/dinegixu.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/denuxemege.pdfIn PDF document text
    • https://peterdegendt.be/file/59509362431.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/begusu.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/53672296050.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138f100b0632---93201881327.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/juvekijojotofaxufovujixal.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/9d717e15a370f07a1c2e130c4ca95d0b/nugodifaputebipadajavi.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/roluvup.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/zutakikiwopazilosa.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/buboduzumoxidodagadigirow.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/16976176261.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/lufepe.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/35736585352.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/vodudasedafesotilufor.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210902221339.pdfIn PDF document text
    • http://novichiha.ru/pic/file/19177999273.pdfIn PDF document text
    • https://carlojans.com/cms/file/39883649757.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210918_212135.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/powufesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=igo+israel+apk+crackedPDF 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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 19948 bytes
SHA-256: 7b9875f82187c3cf9aead7285c1c86248f13e608dfc5e7fc5088dd410ff29f3d
font_01_sfnt_off000118d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 10528 bytes
SHA-256: c2cd41cc76496d7d250b38fd841b2c2f7ce49a225163ce5027564f6f932e7130
font_02_sfnt_off000130ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1