Malicious PDF — malware analysis report

Static analysis result for SHA-256 01898c5a185350f5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 02:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9494dcaa5de3f4cc04b5ee0d9c3d06e8 SHA-1: 36e5443f4948cb1f97ba9528c9e6391d725f6666 SHA-256: 01898c5a185350f56911a228046a7bbcf22fab0d50a5a39934549f1a81d498e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, coupled with a critical ClamAV detection for 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The ML classifier also flagged this PDF with a high probability. The document likely serves as a lure to redirect users to malicious sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/86059935271.pdf In PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/59881803025.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/liratulosujeti.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614637592ba11---nebesoruxaje.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/62900455876.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/sekenefazezoki.pdfIn PDF document text
    • https://network-italia.com/file/5113108740.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/34406031682.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/47424152810.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/wuzedem.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/sazuxawipubaxadotenuzu.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/81458981179.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/98688303998.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/44705320393.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/mijetadesojoforevamino.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/17225478154.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/sixinomuxuvafi.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/89286962005.pdfIn PDF document text
    • http://proxima-online.it/public/file/19682477130.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/lafatenufakavebunavebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+4+tbogt+cheatsPDF 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_off0000bbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDD 17484 bytes
SHA-256: 02ad016f401811c89706e5e1222af8a32bdfe210fa2ed68bae4e403b6f7fd028
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 10424 bytes
SHA-256: f33cd4fdf352afe5f4c0a1fce6161bd8b934e63dace6cf8cad4172e36946a6f5

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