Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1cc8ea839fa36a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 05:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9022aefe8708a416fd864e3242dd7b92 SHA-1: f970ce2196f7a15d6130b4ec2718350705c0736f SHA-256: 2f1cc8ea839fa36a70fc56022493830b58c22f70e46ce3e4c3ec96701dbc5607
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file download links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, suggesting a coordinated effort to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of numerous external URIs is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=18+again+streaming PDF link annotation
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/tamuvigemuzozelibinibiwa.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/buzadokaz.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/galunekiri.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/lakodelob.pdfIn PDF document text
    • https://successalpha.team/upload/files/13107787524.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bonemexeni.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/doxok.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/kumevodekazexejapadexu.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/56312878737.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/27301163407.pdfIn PDF document text
    • http://davcpundri.com/css/file/97116634910.pdfIn PDF document text
    • http://lagrupacio.cat/file/muvaxakapurerij.pdfIn PDF document text
    • https://best-label.com/upload/files/xalonizijimuzev.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/85717366351.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6f7960751ae36c1b39db035580f4a1e3/81502975473.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/jabadetavunobaw.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/jaduwekodubobasifujowow.pdfIn PDF document text
    • https://samowar.me/userfiles/files/3859304149.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/pitaxetuk.pdfIn PDF document text
    • http://checopharma.com/upload/files/kavafudolegazuteteja.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/95937657301.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/waterimufakaf.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/29226241281.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/zureguwi.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/41142760478.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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 10448 bytes
SHA-256: 8ab993b7f0324fb246526b5c23ee224c0c64e56e1e3f37218c2d5a94517ddb9e
font_02_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 17860 bytes
SHA-256: fd6669dfcfb390932ace763816a689625694659d9876084df1f1600f1666e108