Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62112e7b748d20e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 16:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f4e50ff297ac5bf84a57e904dc07dafc SHA-1: 1039dd0540d431a195efae489f65f1bb649a19bf SHA-256: e62112e7b748d20ea39b33c729565d1cdcb96248e86530e536bf1616ff35f74d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=is+there+a+way+to+remove+a+snapchat+filter PDF link annotation
    • https://izyskately.ru/foto/ck/files/kosizo.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/wepasuvoxepamusal.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614445eccf891---7816726682.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/81964824944.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/pozowa.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/40498129386.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/54907137339.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/gubunapimofisuxunomodu.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/mudunibitit.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/50822272087.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/wojozujogepekiwab.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/dirumomerorosovopatadupe.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/wotusofewoxovamipir.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/wifanadano.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wufimilinusitetuf.pdfIn PDF document text
    • http://www.polni.si/Images/files/wizakavujijotozutefimur.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/10086548198.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/26000602181.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/51536563030.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/85418064708.pdfIn PDF document text
    • https://italvaping.com/file/wipudepet.pdfIn PDF document text
    • https://cncunse.com/d/files/20546845619.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_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 10964 bytes
SHA-256: 42b64e60108a66bd0ee4a6d7de49abeb76acddf21189ad5c1fae201e2d3b035d
font_01_sfnt_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 17756 bytes
SHA-256: 93d296423701b6c8eb3d738c5825c85a33e2421a2982816bd8bfa5d2ea3eb10d
font_02_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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