Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba472b5f2917a756…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 19:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40d16ec5b624435b844f5dd3f0bf7dee SHA-1: edd4e8c3ff9367e44f74d76b0c4f50ed6812e0de SHA-256: ba472b5f2917a75605967ccd5c263e3d07e8ef3cce7dddce08adbc9c45bbdf35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://barudan.hk/UploadFile/file/20210908215438554.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349b5f34468---komome.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/xoginitemuwixe.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/99870268232.pdfIn PDF document text
    • http://dgkno.cn/upload/mavebejatoronasupev.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e24a3e301f158e03d58b6b93962fb38b/xusebusav.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/37712871704.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/kidomaxasuvijujanom.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/67040723461.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/vizidusodebafibedesujid.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/49357064325.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/49901607274.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/96588958905.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/ruxijaxabafe.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/moxoper.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/20019447764.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/loxigemusetatevuzisogo.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/nimepadirixiwipaxemob.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/11646291599.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/62771750978.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/bixusimakojasuzinufini.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/67331423162.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/rovozifitu.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/lasukapusegex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+faded+ringtone+for+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_off0000bb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5E 20984 bytes
SHA-256: dc908adb5be64bd155883dc00e1a9e42b0c0d31ca0dc5aa7c9fbdf88eed48e8e
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 10448 bytes
SHA-256: 05aefa9e191a6e15e77e229bb9ed08ed0caac8bb3f04c5806d93eb51c10e25a2
font_02_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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