Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acd83349e4582e2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 03:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cc27f25edc303951af430f6af665660 SHA-1: 1939ea93fc0ebc5324356f696a930ccc83079b1f SHA-256: 5acd83349e4582e229b1f33ff60f81c36b48b15ac5897b5b4397fd916e641e87
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://unstitchedfootwear.net/files/file/zomusipibudutazolez.pdf In PDF document text
    • https://projetounificado.com/uploads/files/kulutijagawumimuxanalexu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/12776581866.pdfIn PDF document text
    • http://sung1.com/upload/files/fiteniraluzep.pdfIn PDF document text
    • https://tuinvandecruys.be/file/64104859345.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sukaxifef.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/merefuk.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/balubut.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/23738852041.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/37851146915.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/5691487357.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908202647_wnhyli.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xudisumalivizaleti.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613729a755164---niveso.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/tabiwibu.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/vopidazon.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/73696588229.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/magobujasefupapogadip.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15a2cc179---gakogigata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+cloud+white+gba+rom+downloadPDF 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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 19688 bytes
SHA-256: 7841819f1b1831afb375e15e91b8c26a188051df31290b24074ef5fee4a90e3c
font_02_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 11068 bytes
SHA-256: d0b5cb23c6580dc443089002605b155b012e779a9b3590c1db5fd51639ef6b1e

Open this report in the interactive analyzer, or submit your own file for analysis.