Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7d12bf8d9f3fa7…

MALICIOUS

PDF

75.6 KB Created: 2021-10-07 23:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbc852a254ebfb5a36874686f0c4a2b9 SHA-1: cd04ab9a0a90ef9f8a25256c6f9b35cf7c432d73 SHA-256: eb7d12bf8d9f3fa77abd8e7cc339cd8e8c776e3055d1ebe3aade2a7ea99c4fe3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a phishing or link-farming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. No scripts were extracted, but the presence of numerous external URIs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=foot+fetish+party PDF link annotation
    • https://dampinggame.com/calisma2/files/uploads/61265582576.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/43857933345.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xajawepulubumiw.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/41293592422.pdfIn PDF document text
    • https://tigapilar.com/upload/files/62741209180.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/jiluzaburopevuxuzuxivi.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/rasobu.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210918074558.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/pilavemaliworaxoditasekox.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/molugaromotesa.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/bujutojosa.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/zufugekowida.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/22298301227.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/14058646008.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/fazuzezego.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/48477565433.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/85545170693.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/mevolibudejojidoze.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/nidizapuposowi.pdfIn PDF document text
    • http://hijoin.hu/editor_up/vovasukaxikek.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/dofiwit.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_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 10396 bytes
SHA-256: 25a568af97b032c8bc19c2bbc526877ec2091935e6cd344aadd1b6affbfb9f24
font_02_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 17760 bytes
SHA-256: 4b4d356abfadbb0a27b9797eb42aadd214476fd34531d15dcf24018c5bc572ec

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