Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ecbdc29d4030ae…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 02:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11e05ac153feee34df505fe78ae08a68 SHA-1: c46ffe5705390aad8a61574c31468273583f3461 SHA-256: 34ecbdc29d4030ae8b32b5aee8b2d91316b49501aba1b285073951b6b4e15379
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The sample's structure and the presence of multiple external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=game+download+app PDF link annotation
    • https://kme.pl/global/app/webroot/uploads/file/16306562795774.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/nipufanul.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161433b99d4e73---zowetesedi.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/dokemarigu.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904073018.pdfIn PDF document text
    • http://apicn.net/upload/files/kijuniruxukun.pdfIn PDF document text
    • https://masihpt2.com/contents/files/20558462860.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/73565354534.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/70200588003.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/zuxukimedebo.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/95159526443.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/xedozifiranipavubinag.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/77262144808.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909014910447.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/38645981118.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/7373481024.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/notapulovobabosebiw.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokalebuxifabixug.pdfIn PDF document text
    • http://chinalabware.es/d/files/81869720594.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/698eghsj0ml837k99cpuh1svqk/696525463.pdfIn PDF document text
    • https://arendic.cl/files/53717209056.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/30862896112.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/61341690091.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21894418292.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/vabodotobene.pdfIn PDF document text
    • 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_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 10220 bytes
SHA-256: 3cdb9bdf1b5e6a0835b8535eac385b705ec6770b4b748f01fca4919ede4495a4
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 17192 bytes
SHA-256: 26665493108cfc93ef15af44b164d77da6f77905e529e0043e491d379739fd6f