Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea842401539eaad7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 07:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 05c2a7b9a1d361b324eac53a80bf88f1 SHA-1: 2f1824b5963a0f3b43c9715f18e8ab97bbd8ba6d SHA-256: ea842401539eaad741eb46242ccf25472663b674613ec4cf0a8df1824c1a15e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious content or phishing sites. 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 0.9977

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://ifbscalidad.eus/files/galeria/files/1234813689.pdf In PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/pizepofedudewevatijo.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1505076418613bb86f1ee65.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/31615498604.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9c43363ed861c30d37ff1ab9174b02ba/lugopefipuno.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/91ce98e1322261b7fd6c6b998706e404/59483689543.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/pigetizasarovawixejip.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/lolawaxarapujojemire.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/89120304611.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/volalakuj.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/kuguj.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/2515206383.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/13284677317.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/14491559939.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/25640231009.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/riwixevamov.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109021347459268.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/86801762266.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/15991038838.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/54680251206.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/bilelomikop.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630618026.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/lusezisuzeturapimuduwuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+loop+audio+on+androidPDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 10264 bytes
SHA-256: 88cb9ae28553df590316c0e6c7849c3a907a2d2eaa422564c572958b008288f3
font_02_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 18864 bytes
SHA-256: f51118f87a804ab53e336460528f5c4d5b3536714a8cb06e48886dcd8d90b0d6