Malicious PDF — malware analysis report

Static analysis result for SHA-256 468486ed0f1d0f60…

MALICIOUS

PDF

77.5 KB Created: 2021-09-22 14:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3188fd72a4552090345fec4993245c92 SHA-1: 189fb467abb8b9adb8e64464e4a8f020885dad47 SHA-256: 468486ed0f1d0f60708de03fc4cb41099a2382353163e7f0d7d4a41c0b8f5b1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed here, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=social+network+positive+and+negative PDF link annotation
    • http://safetruck.gr/images/file/wowojosa.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/61963602216.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/palubowuvi.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/39150163004.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/54405623851.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/nuvoxexekugujadik.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/9806384526.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/42313679836.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/37556854152.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/74485343810.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/46842477951.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/tibofi.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/82547920737.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd95db089d---zasiz.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/jikiwaxumo.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/wowovimapinakatipi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132394627597---90764284057.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/3507986946.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/93760905868.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3557123a---1969238971.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/pekuvaxop.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_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 17464 bytes
SHA-256: f3a6e1f5f32c2b6499d0731a6b26b6d7f2ed2cb8950628687f72cf1b70f23bdd
font_02_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 11008 bytes
SHA-256: 85b2cf52f619d514f539b07a9804acff3245323e81bdd8c046de678a1425e264