Malicious PDF — malware analysis report

Static analysis result for SHA-256 8303a1833c7af750…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 07:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aa378587110b944fd56846846d32f74 SHA-1: a06127f049ab0a4693a53588b68fe1e8a2b5136d SHA-256: 8303a1833c7af75089be2e83378f3869dd1d5a720a1fd170ffca876cb3524b43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF viewers or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, and multiple external URIs were extracted, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=how+to+watch+movies+on+android+phone
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mthd1fcm586el2m4mkgn624ns5/3354219651.pdf
    • http://zit-tech.com/userfiles/files/78903359166.pdf
    • https://trimix.bg/UserFiles/File/32758070807.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0f0b384ea---rejixajepuleripejofem.pdf
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/78565152771.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/81732710092.pdf
    • http://netart.hu/userfiles/file/3074432540.pdf
    • https://dalilak1.com/userfiles/file/busexixowotilibu.pdf
    • http://gibisch.biz/files/files/dovetijorifujujoxexodig.pdf
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/30199678936.pdf
    • http://szjg.hu/images/file/vaxalujunaxe.pdf
    • https://obermeyer-modemarkt.de/upload/file/wogoni.pdf
    • https://razredna-nastava.net/files/xefigoxotiwelojufubenis.pdf
    • http://cahayamimpi1.com/contents/files/75500528694.pdf
    • https://spandoekland.nl/userfiles/file/34366753261.pdf
    • https://ssekolkata.com/ckfinder/userfiles/files/76092929397.pdf
    • http://arkystudio.eu/userfiles/files/82170142328.pdf
    • http://sanmorales.es/userfiles/files/6780475734.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/wodenuxepupu.pdf
    • http://lavalnerina.it/userfiles/file/63277965684.pdf
    • http://ty-universe.com/image/files/20210918_073536.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/wawuzujepolof.pdf
    • http://abwwilson.com/uploads/files/344569827.pdf
    • http://eternalcycle.com/FCKFiles/file/niladobosidipamarenux.pdf
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/likesepiw.pdf
    • 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_off0000b3a7.bin
81102a9db2b5fa45cf758d11861c82a937a27ae65ad0c774217c51d7b28cfad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 10876 bytes
font_01_sfnt_off0000cca3.bin
c7b36912aa154f2102c81be54cdb35c0debdfeefe74526619ce091f823a87168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 15864 bytes
font_02_sfnt_off0000f460.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 16792 bytes

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