Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f374d2b836da784…

MALICIOUS

PDF

69.6 KB Created: 2021-09-08 16:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 66c4f6719ae01b125eb49a8a226820a3 SHA-1: bee1dab4125e5648b7101542873f1386b227aaf1 SHA-256: 4f374d2b836da784d6439b2ca202ebcf9d7081308e3533fb4b825d43ae9527d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=manual+shapes+ggplot2 PDF link annotation
    • http://michardardillier.com/ckfinder/userfiles/files/dedimixarovogavileru.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/75766682891.pdfIn PDF document text
    • https://abss.pt/userfiles/file/87708220663.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/vubesafuwulabiwilasoxe.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/98646766738.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/vosikaxofo.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/95104525346.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/fosoke.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109050751505682.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tukilufej.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021941751503809.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210903141412.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210904000308.pdfIn PDF document text
    • https://12shio2.com/contents/files/zadibanuguzidenun.pdfIn PDF document text
    • http://martonelektro.hu/files/file/48959092555.pdfIn PDF document text
    • http://mamitobe.ru/files/file/bokunimofotewi.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/85745221848.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/zanaregifixerimos.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/vupigegixim.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133819438c2c---pevasawiwobuxawotesagarad.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/85090611757.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/kilemejesiligevifilak.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/joditizofasomigap.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/givaxosujesapufut.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_off0000b42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 10552 bytes
SHA-256: 16bd9bfb50eb12da0fbd1c5a4f099eabc1e050a244d0438acca86a8d3c440f4c
font_02_sfnt_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 14540 bytes
SHA-256: f03351f5dd5eea04f538ec7f3d2c73ecf10cd21bc6f0c8073d312efaf2608ffb

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