Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b69d6fe16a109e9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 19:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90e48aa8f83956b9dfdef86e9dd1ec2c SHA-1: 502ea0cf01504143ab8f63af5f594b14a3b85339 SHA-256: 2b69d6fe16a109e9e3b6d3457f1ea03814e3f0258c83ae593a39a525b9651126
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a specific rule for link farms on disposable hosting and a high ML score. The document contains numerous embedded URLs, many of which point to domains that appear to be used for hosting or redirecting to PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a malicious intent related to manipulating search engine results or distributing malware through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=read+marathi+books+online+free PDF link annotation
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5df23668a---sizamewitazadigide.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/nubuxerewa.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/bitotusafogole.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/75370623660.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/menudabefela.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/xekuminivamotuxas.pdfIn PDF document text
    • http://germainelecocq.it/userfiles/files/76026658580.pdfIn PDF document text
    • https://sopkambing.com/contents/files/kaxufaburivoki.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/tokadanirevovavevux.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/29832511803.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/93626695572.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/17683694831.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/20747358686.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/siwogobire.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/vugoge.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/73131157314.pdfIn PDF document text
    • http://unite-chem.com/upload/files/83145238083.pdfIn PDF document text
    • https://ksboutlet.com/file/files/tizug.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/24511963537.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/38000030347.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/50915574616.pdfIn PDF document text
    • https://promise-land.com/upload/file/84137597473.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/pekokiziwofugat.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/57644620374.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_off0000b1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 15748 bytes
SHA-256: b5f8ef032298aff56c32a92d121db4e2d060a04c9ed59aeb31341f50e75c9763
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 10896 bytes
SHA-256: 6decd5d7c09d892b19c35f7a0d07b796dade9313e6cd7043e131d620c067018d
font_02_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1