Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a31a3188eae710b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 08:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4a4ee9cdee6b3767aab3ce7f9460ada SHA-1: e9238e65747cb485d528d9d209a0c41b4e56b5a1 SHA-256: 1a31a3188eae710b6966cac03e8cec26c1309236fc95bc3fc6c12d46ebfcc244
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URLs. The PDF structure and the presence of embedded URLs suggest it's designed to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=harry+potter+part+5+pdf PDF link annotation
    • http://vegman-kzn.com/ckfinder/userfiles/files/vuxetorosiwejunut.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/vajemiduwobo.pdfIn PDF document text
    • http://c-six.it/userfiles/files/rorasiveruzes.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/lobezamobog.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130698259ff6---bikanokemajodakuvek.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/delarodozagatokewugubaza.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/polotixot.pdfIn PDF document text
    • http://technocom.pl/editor/file/62702921646.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/bopaj.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/34298340343.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/lobanuragozepebowek.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9f854441---xapuxowu.pdfIn PDF document text
    • https://siroyensao.com/upload/files/51470115825.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/gemipitu.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/51478139741.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/68690211318.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/23111484381.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/75774468093.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210914110322.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210910191242.pdfIn PDF document text
    • http://medrea.ru/upload/files/89010017694.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/90996466586.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/89390814920.pdfIn PDF document text
    • https://fuoriscena.eu/file/misokasega.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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 17580 bytes
SHA-256: af2809078c495dd552dd67f756a360957f25289c55a5dc15d4c7b8587e0a2125
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 10320 bytes
SHA-256: c12acbb03522125cbc0c787cd45fd55e95a65857edd5d1e7ff47ae9de7d78041

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