Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a927d718d19d07f…

MALICIOUS

PDF

94.4 KB Created: 2021-10-08 16:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d63bfec1341a0134ead83f0572c4efe SHA-1: 9204215c6ba1167e86969a427ed73fae8feed9be SHA-256: 8a927d718d19d07f8f99508f6fb71229d142ac06bb80941b660b975430059007
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and numerous outbound links align with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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=there+are+a+lot+of PDF link annotation
    • http://eatoceanic.iorderfoods.com/uploads/files/solugakezaduduroputodelug.pdfIn PDF document text
    • https://qkon.ca/images/file/bogilekeluba.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/sowivonusibaw.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gopafekilewale.pdfIn PDF document text
    • https://cardolf.ro/files/71101666361.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/nujadev.pdfIn PDF document text
    • http://kelvista.lt/images/files/37379252819.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/vijitisezukeliwita.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/bakinufewumogeruw.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/13786103191.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca66032290---13017296379.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lunebefiledo.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/mipolepimejugemeg.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/23034322303.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/nowunelubememifizojuxu.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/88682275260.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/xaxadawitewepubimis.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d9ae1cebd---feraresalemezimadimu.pdfIn PDF document text
    • https://livbiopharma.ipsrvps.com/userfiles/file/revegiv.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/warititomiwivinunas.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/gutiposika.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202110050229536879.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/46482116046.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_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 18656 bytes
SHA-256: 7b6745cca9ca9f8ccac16d640cae438cc593f82998d4d879a733f025cd88de05
font_01_sfnt_off00013df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF2 9908 bytes
SHA-256: ff4e901d4b8b32b6ebdee5ec2e8c379fec05dc75578d44cb3bf981cc73cd6763
font_02_sfnt_off000153f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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