Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc517e248f781b4d…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 04:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6264dc32661a4e1be5680798362b362 SHA-1: bab92d7b786037d311830c76b3cf9a29c1602132 SHA-256: fc517e248f781b4d7b360ded216898593200ec166283a427674106f6522f6036
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with several heuristics indicating malicious intent, including a high ML score and ClamAV detection. The presence of embedded JS and a link farm suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. The document body was unreadable, but the heuristics and URLs strongly indicate a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://tonitomov.com/picture/file/damapimugopoxij.pdf In PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210917030624.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/12672459873.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/40034505258.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/ripaxekuk.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/73742172699.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/nakemudite.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/jonekumuku.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/gisunetakowij.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/79055664076.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1f952229---zuzodukekevosidawato.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jesabolota.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fedogigegotizax.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/pomukapaj.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/sedepuwakabotox.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/67907732469.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/gizesifemuzewagoposovige.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/26864909366.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/32115639545.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/65930392821.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/vutogolupizegi.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/madokijodagibudumoxokub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=view+your+phone+screen+on+pcPDF 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_off0000aca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA4 10432 bytes
SHA-256: fd6f5755421d11d6f1af8ac097eea5bc66391096e97de76b667242c60725b09b
font_01_sfnt_off0000c450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC450 15600 bytes
SHA-256: 654541b70f036f9e464dc0ecaef94084f0ca4e74018b0138f79ce2914288533b
font_02_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1