Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b88cb642b8fad0…

MALICIOUS

PDF

93.7 KB Created: 2021-10-08 02:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ceebe600f055e9c428d96400e01bebce SHA-1: 74bf170a318e4343f055f0a3c5a4993074741268 SHA-256: 99b88cb642b8fad004dc0edca717162e63ffee0432d39d29b057223e546e09df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://garglob.ru/uplcv?utm_term=plaintiff%27s+attorney+meaning PDF link annotation
    • https://shieldtech.cz/ckfinder/userfiles/files/47762593720.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/93620972256.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/fuleg.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/gawowegedufefowugum.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/15630546423.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/bosofapotepiteroragarovel.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/silowukogajeruwimuba.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/92670406661.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/pulewikenegovixumedisesof.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210906143331505694jp5d4.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/bejitubatoseku.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/25363621044.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/pisetosuwejibofij.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/pigebunir.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc5565a37---rozajapizitile.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/tevugafofa.pdfIn PDF document text
    • http://isvpro.com/custom/files/77232194997.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/xamavure.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1615f628eab1a3---31528689720.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/fajugaligijijezofi.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xemososazujorigigulozali.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/7735775560.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/32966722915.pdfIn PDF document text
    • http://congtyvima.com/images/Download/tonuxodurebafelugobuki.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_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 21184 bytes
SHA-256: 0a34a1a09095dff54340066e6dc29a4cb82363e668112424f833df97c3eea6a7
font_01_sfnt_off000138a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A1 10704 bytes
SHA-256: 19abc396bd3fe99e1ec1027d44baa350fd13324e995367948980cac4d75dbc1d
font_02_sfnt_off0001514a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1