Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a73a224309a924…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 13:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fd0c7bc89a5b7c84be205f5ff848c14 SHA-1: 3a285936dbb6085b10a78f72cd09dc52ee1c7725 SHA-256: 21a73a224309a92407def8c8c4221bfb5e9c779fcc86d926a7dda13196d41d48
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. This suggests the PDF is intended to lure users into clicking links that likely lead to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.sensiblemachines.com/ckfinder/core/connector/php/files/zixesupunudamomem.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/31077725100.pdf
    • http://fujiya-burbank.com/uploads/files/darusuv.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/91555833939.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/sonajimidovewo.pdf
    • http://kalikraft.com/images/file/bisulilidurugivunegax.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jfsmgsbd88noe0a953pvmusmef/koxuzot.pdf
    • https://millvalley.com/wysiwygfiles/file/82570131614.pdf
    • https://branchennachweis.eu/userfiles/file/48826573105.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/8868928792.pdf
    • https://rwd.webseo.tw/upload/files/65526424247.pdf
    • http://nfrostov.ru/upload/files/31383667351.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/17441301323.pdf
    • http://getvisa.ru/images/File/doxefozop.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/s8ram8r80bpiabdonu6cmhpi74/xinileko.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/ruzowurobup.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/dibemeki.pdf
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/nuzurubufi.pdf
    • http://life-homeshop.com/asset/uploads/files/10417588466.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/nirewitawujef.pdf
    • http://ave-france.com/pics/files/valumixirogixozuzedina.pdf
    • https://hijaulumut.com/contents/files/69202117278.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=123+online+telugu+movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f7.bin
ebf7728dbb0008e2ca84d5f11c03de5466d8bf1f915eb861cdddfb8916d9f485		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 10604 bytes
font_01_sfnt_off0000f146.bin
f2c6be9cb309bbccaee59aacf3d5d77b179bb62adb54d3f662221cd19fc62090		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 17076 bytes
font_02_sfnt_off00011d1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 16792 bytes

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