Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e8e5e95bfca3df…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 17:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: abbb2a20f029f3411fae486f29142a97 SHA-1: 5d7d39194816b8e477ec3a25027d1f3fe5cf8046 SHA-256: b1e8e5e95bfca3df992d86385dc32e781af1f1ae32ba8481094f35869b2eb6e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and numerous links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=prime+android+tv+apk PDF link annotation
    • http://ieltsadd.ir/cache/fck_files/file/38345206993.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/67340393926.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/33798046626.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/remakabavo.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/76750496517.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/matuxesowisonemogu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/85202453253.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/mawavoranaf.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/wozarixaxevebefugofufi.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/murarekosikasazeva.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210916_964073DB6F190FBD.pdfIn PDF document text
    • http://teplicky-fotograf.robert-zauer.cz/userfiles/file/tedoworisegoropefajazodu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/52098271776.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/wowemizivelazabereju.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/55874728228.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161483d1233ba3---36513890507.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/darajumanakat.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/75972353408.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/kegesaguwegitokujaxeto.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/26127481144.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6a39dce8713c763ceccff111ac12579a/pijakuzikatofewozid.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/xixapixizawuburatuf.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/bavalewusuw.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/dunabatajoroxom.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/20490475219.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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16012 bytes
SHA-256: 694458faae32349dabfd711e224be1fd0625af9943d39e3403f6b0055f554f31
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 10496 bytes
SHA-256: 595165043daf374e2eb369b11ae4f8cdbaa49dae276b7188c6cb05e60a9fdff8
font_02_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1