Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95e9a7bd1c407c2…

MALICIOUS

PDF

94.9 KB Created: 2021-09-22 11:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc3c458b06dca195ecbba8f933c23568 SHA-1: 7cdbc5c69e52021445a36090e403b84bd2b85a71 SHA-256: d95e9a7bd1c407c231157ce507ae720717d22c3cae93274fdd88c8fcb7ccea0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on disposable domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://awarelaxcentrum.cz/user_files/file/42577347773.pdf In PDF document text
    • http://poslovniimenik.net/firme_data/files/53387052281.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/fodupurosexogopojexajilom.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/borarefojanikobemorebewek.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/mozeram.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/30703529603.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/gexuvegaxalokaxiwovotu.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/numilabodokejuzerowe.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/vuzisinalutigufegodil.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133904c37233---72299664424.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/23314205316.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/97944873543.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/kezagagaxobivevu.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/buluxinutogopiladad.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/xorufusafaw.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/rekokonemiros.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/7781589665.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631027766.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/xiwumoxaxetejuvoxoto.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/xugibudegobojedukakijol.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/90329414752.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/duzitiwibudufajatojerib.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/xemizimogelofizuxabulazut.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/pewoti.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392360ba269---25979168922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=home+alone+2+123PDF 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_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 10148 bytes
SHA-256: c5708080b28c57e23e392ba87a3382b954402f2b4d6e7f2192861d6d76ab9745
font_01_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 18564 bytes
SHA-256: fb46130631542b47df3add3d7aea107a8aa9e8d2cf05d6d78c2c93a9a4e39015
font_02_sfnt_off00015658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1