Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e582f2b6aefc24…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 22:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 212db3fd0076af2f889dbadd678f4fb4 SHA-1: 625340c318e8df51e874922619548f2ca33d8c2b SHA-256: f1e582f2b6aefc24ccf9c2049e69435449bcdbab87b8bd1d46854153ba7e88b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, 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 URLs suggest an attempt to redirect the user to malicious content or download further payloads.

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 https://pistant.ru/uplcv?utm_term=bug+youtube+android PDF link annotation
    • http://studiotrusso.it/userfiles/files/95121477097.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/98456218678.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8b2f089442626ad14f0c1a089fb7b06e/ginuge.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/gokutunowisipumotumiw.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/14115618187.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/zejejoralino.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/tapekabezowanotinux.pdfIn PDF document text
    • http://hflchw.com/upload/file/93433721131.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/rikixozunilejuta.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/balunopazejilopaseluz.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/83380077060.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/lageropade.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210912151601.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/rosoruberunixalobudepuz.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/witamoposodi.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/10409248073.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/31194872162.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/47961756336.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/volaxunoseb.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/67409845828.pdfIn PDF document text
    • http://machulski.com/public/file/sesirotizajuseboxino.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///77306391712.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/tabotabotazudogagebupava.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/jawugudoporezujani.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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 10616 bytes
SHA-256: 8b39663839568643756b1e3f28b9fed7e5fae9252be5645cf2fede6c28f55bdf
font_01_sfnt_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 17852 bytes
SHA-256: a548917940bbc284440d7a944f8703b7a3d86d15b26f7ea3491213e4cc109b6f
font_02_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1