Malicious PDF — malware analysis report

Static analysis result for SHA-256 438d5472f8aaff1c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 18:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 013ed555e609250474533ed81c8d7858 SHA-1: 311d92e1e46cecaa7d0635dd73ace48735071154 SHA-256: 438d5472f8aaff1c8b1dcd25c37dc32fe006ae098b87fe0f61da67c71f977175
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 domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into visiting malicious sites or downloading further payloads.

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 http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/41401693576.pdf In PDF document text
    • http://weiken-rc.com/upload/files/wudega.pdfIn PDF document text
    • http://xtra360.net/campannas/file/29427842647.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa70c1e440---3691562678.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/dozujatenafoso.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/36101478224.pdfIn PDF document text
    • https://fond.ru/userfiles/file/fovafabovatem.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/wubijaludumagijej.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f803bbedd4---kowabuboxutajomo.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/1384297333.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/9035423783.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/kegomuwuzarim.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/43014444452.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/zetolemebapewawebodumuvo.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/watoxezajejitunixosiza.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/fifexid.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/silobijokeba.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/nalawojepoduwufafujixozoj.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/donoromifedono.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/mamuvazulegaligugaradise.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xapokejef.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/75309572497.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/kezas.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/73676681344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=change+default+font+androidPDF 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_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 18240 bytes
SHA-256: b443da0df30af68af60c157552320f04a1508bff3e85df57f7323006f2b12696
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 10596 bytes
SHA-256: 77a68c08222e770b9d214f05f0f958cf769d5b92e04089096de5c547e4b0a003
font_02_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1