Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9028d19f809d84…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 18:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21819a0d63a87a2c7ef63d8e789a1183 SHA-1: 4f96ecea4fa4408ee3ae8a11cf55559ffc92fc3b SHA-256: ea9028d19f809d84f0035ea807268dc1cc700a52e3abe153be2dcab295835fc2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs indicate a likely attempt to manipulate search engine results or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://teplo76.ru/uploads/file/sanariluzesozazodaf.pdf In PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/mivilibalax.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/zarusugelowibe.pdfIn PDF document text
    • http://rococosofa.com/files/files/35530065036.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/83910457599.pdfIn PDF document text
    • https://sanidom.pl/img/file/letuxokem.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/95069110942.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/97102129704.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/12899956701.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/49291496886.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/97331768466.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/8707232773.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/bepakusez.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/51034011425.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/noginipakarovif.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/lapanomojuv.pdfIn PDF document text
    • http://coffee33.ru/archive/file/jofasunatasobe.pdfIn PDF document text
    • https://atiksigorta.com/files/12739798584.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/xazifataxur.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/zujub.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/tegezenividoru.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/xefawular.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/70518927805.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/8427542852.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/15604459731.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144e458384ce---wafuforuxukekiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bulk+serp+rank+checkerPDF 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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 14524 bytes
SHA-256: 542b89cafcc461a40734c5927792767b8ac7b6e3550d0bc7ea38ebf0ae1193a4
font_02_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 10408 bytes
SHA-256: 4658a357db05b9a2a3f0a65905ca9864d505921f4ff21e578a11c2c854acf4ae