Malicious PDF — malware analysis report

Static analysis result for SHA-256 56488cb8abf98b65…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 00:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea6719a12c0929b5bad805c04b5ab2d0 SHA-1: ecfd53c2af50a921afc3d9d848032954fd6169e4 SHA-256: 56488cb8abf98b650087371b9d359b6ab55e03b56f95b064eb65c1ec9f13e4ed
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many pointing to potentially disposable domains, suggests the PDF is designed to exploit vulnerabilities or trick users into downloading further malicious content. The ML_NYX_PDF_MALICIOUS score of 0.998067 strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://djecijagarderoba.me/userfiles/file/modapegotokuwaru.pdf In PDF document text
    • http://anninh247.info/upload/files/13169334295.pdfIn PDF document text
    • https://ijp2.com/contents/files/16236327187.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/jiragaguliduraxemered.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/45408284463.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/52624011828.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/bedarutuwiriniwezutadal.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7ab37320---61527466964.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/resimajovazakabaso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2eca3115---vavudogiwa.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/jixuzu.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/31008261172.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/sesujatilopap.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5673290233.pdfIn PDF document text
    • http://chromoink.com/updates/file/44943693333.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xowuvabosagavowil.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/fajibugaba.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/30596052048.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/87946151396.pdfIn PDF document text
    • http://scpt.it/userfiles/files/43547517517.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/65664981888.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/25311709537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=malome+vector+dumelangPDF 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_off0000b9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 10612 bytes
SHA-256: 81cff43ef6c20cb1f9f3188bda233b8830e2a37a70c0c5421fe400a1cbbac360
font_02_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 16236 bytes
SHA-256: e1feb920c8429e7fc56fec1030ccc50287e1c9f29b8d7b3777fe2158cb7b28d0