Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf54384c5e06457…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 23:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7a14102565e94e4c58f162ae9152b21b SHA-1: e401b308e4f691beaec5cbda3567541dff6687f0 SHA-256: bbf54384c5e06457dcf812771c0228aa06170ee690138305456bdcbfc13c346b
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 0.9916

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://desiaussies.com/ckeditor/uploads/files/56029907931.pdf In PDF document text
    • http://tainghe.vn/userfiles/file/sofivadumavamuda.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///sasadale.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/funukozaronusazijigal.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210904045739.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613048d3bae01---dikibupiruw.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tabefef.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109030558306622.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/laxigizanuguj.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/kukila.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///reporazutejitemu.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/36867067269.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/73818025935.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/bixitemusi.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/jasorod.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/26744796289.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/rezevimeritekazi.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16307383641611394097.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/keretavepiwiza.pdfIn PDF document text
    • https://majubesar.com/contents/files/87118548592.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/wirawarujoweb.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/senovavelovilarij.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/gumupubibenebazisadid.pdfIn PDF document text
    • http://onelove.cz/file/xusugeku.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/4174924664.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/99991676497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gta+v+game+download+android+phonePDF 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_off0000b904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 15200 bytes
SHA-256: ac61d7a96799f773dd09ea8ff1e410958857ce7556ddd9596946755bb4b7580f
font_01_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10864 bytes
SHA-256: ba8980c8f35a405efc3ff064cae5824bbec7a2dc395f4b3724909f00ff8a46ed

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