Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ed7100bdde9c4c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 03:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6efb4146be24326725667bd70d95abc SHA-1: 81f0a5928b0dfb64a25011848d2653c3a6e3a818 SHA-256: 34ed7100bdde9c4c0f7c7007a805fff2ff698264a858e1f457b06243d9110c5b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bilegt.mn/userfiles/files/guvazijifajususonegiba.pdf In PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/pebudaso.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/41374546746.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/nupufosajep.pdfIn PDF document text
    • http://ranch.pl/files/file/1784772518.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090915154573499.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/wonasirupa.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/tobisusasirifuv.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sasudowiwiwojarijabus.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/nomarex.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/nufobofuzoba.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/96465209024.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/9767694522.pdfIn PDF document text
    • http://electric-kernbichler.at/53685610294.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/xitokosakoninomab.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/8943684138.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/31210477567.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/50575602462.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b570c8775710c0d35b4dc64aea6e5f2f/nemekikabowerikug.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/57359684222.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/87747129137.pdfIn PDF document text
    • http://bakoca.hu/files/file/fobuvajijuwevalutuni.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/60970736007.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/sutebexozirixun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=stick+war+legacy+mod+apk+unlimited+upgradePDF 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_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 17144 bytes
SHA-256: f281271fb636bac20b19bfdd24fee7247f023d1edd2061866e0d5293e1ff3c72
font_02_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 11156 bytes
SHA-256: 00ee26d7a9c5cf75d09b9b77c0404ddb0e40d78c5ddff58d50242d9ec0d4f266