Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee88e2fea61b2a5…

MALICIOUS

PDF

71.4 KB Created: 2021-09-15 21:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa228f2e7fe9d33eafb8fdceda8b02d7 SHA-1: f72677c388e01681c9433782a8916259e32e921e SHA-256: 6ee88e2fea61b2a5b8cd4d0fc784688990d5f76fc1bb6d4b963eee52ca74bed4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the overall nature of the links point towards a spearphishing attachment (T1566.001) as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/moposadulakazi.pdf In PDF document text
    • https://doina.md/fckeditorfiles/file/25859504059.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dogukasikigokunu.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/74414539603.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/tusejizufutetif.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/situgovemijutaxo.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xozapiporamuzegobatiju.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/vegapugerupivo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b10d0a9f6---faramoj.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/49543663883.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/81123113394.pdfIn PDF document text
    • https://southafricapools.com/contents/files/33127480520.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/rokuzogubawutagowute.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/88721818472.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/safuniteluvarunibukek.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/kofelepuvelaluserepe.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/56330275745.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tenexu.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/gurudevopilanirudududun.pdfIn PDF document text
    • http://crediramasrl.it/public/file/76220164338.pdfIn PDF document text
    • http://klinok-saintp.ru/files/renereratopujufefiwup.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69f88ab30---rosumomilijuv.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/sikifubolutozi.pdfIn PDF document text
    • https://kimcert.net/E/file/wixefobusup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=simcity+buildit+mod+apk+android+1PDF 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_off0000b547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB547 10948 bytes
SHA-256: 3b66e7d888078cd0c2b2714e5adbbe598950e12136d2be87276e1ee01debd929
font_01_sfnt_off0000ce71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 16144 bytes
SHA-256: 9207a3ed111459853691ddfb1d08f461db486ca9010476ac6400636a3d4f3d1f
font_02_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1