Malicious PDF — malware analysis report

Static analysis result for SHA-256 674fb8ec428ad92d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 11:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 146dd81f323525453b0cbb6994ab2d70 SHA-1: f464f96c80486cb52e9223325a208f2686541333 SHA-256: 674fb8ec428ad92dbc9316ab3d5d8baa9bf1c251551dac6146aa2d3dd2bd4566
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kbo.pl/ckfinder/userfiles/files/50620655888.pdf In PDF document text
    • http://factory-01.com/js/upload/files/girofanobobiropikularezu.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/jasirufugigagawo.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109101112072427.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/pexidatabexewita.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/pelupa.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/legumutitapowa.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/metoradozelexi.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/51020335041.pdfIn PDF document text
    • http://melvin.cz/data/8458547814.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/pebuzorezajadireg.pdfIn PDF document text
    • http://raczcsalad.hu/files/jodetebomivu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/203cb244fc82da37d4f2fd3a7d30f73e/tifutetij.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/gokumavizup.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210918043656.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/3244479899.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/89396606989.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vavixikabogajijorivetesu.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://millvalley.com/wysiwygfiles/file/12757192553.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/pogadururoresawekeno.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/peten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=coc+mod+apk+download+2020+unlimited+everything+latest+versionPDF 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_off0000ae63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 16204 bytes
SHA-256: a01205dc06c455065f531d98905e838328e6ce91cff38d1163fdde0dcdc6f45b
font_02_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 11692 bytes
SHA-256: d7e81dd6248c4efbd4155a18c39364eeeb07f1137e06a3be34cd2cc32bb35390

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