Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79d372acbbba0f1…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 23:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e28d372f3b79117f97762de8ba3f742 SHA-1: adca54ccc660d09c70623fb5d9147731b7ec6746 SHA-256: e79d372acbbba0f1c1bb24c6e4c979db9e16545782d9cb316992187b59588e21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=codigo+etico+del+pedagogo+en+mexico+pdf PDF link annotation
    • https://we-plus.tw/ckfinder/userfiles/files/xizik.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/gatexodovas.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/6375182996.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/43074888715.pdfIn PDF document text
    • https://proxus.nl/file/jewefenomo.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/69135778643.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/86899875912.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/muvubivejolusojekilir.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/kixive.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/63312419479.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/16998297141.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/48158276182.pdfIn PDF document text
    • http://jar-ted.pl/file/tategarelegabuwupunet.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c43ca204a4a23f0b0a93eee7eb546713/78602926183.pdfIn PDF document text
    • https://media-get.com/userfiles/files/ronalugi.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/28046698432.pdfIn PDF document text
    • http://tzsunup.com/upload/nawovudato.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/juduraraw.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bakigedub.pdfIn PDF document text
    • http://aven.su/userfiles/file/30698954753.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/wuwifudidebipopibapu.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/27827316292.pdfIn PDF document text
    • 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_off0000bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 10828 bytes
SHA-256: f04b26f4f69c2fddd3d29bb6576a0c9de0ef8e8b66d14014928effb084a50c47
font_01_sfnt_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 18312 bytes
SHA-256: 69afd2fabc03fb82fe9d614d31715a60a99aa1e9330b4a327a5aa00a9b1a87f2

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