Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5699dbfd5e86095…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 02:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f3e6e03c44f75bc990d115f31d7388b SHA-1: add548916535ef23b63d41dc7ddfa9f56b0b19b1 SHA-256: a5699dbfd5e86095a1391f4673f24f931a1f8c1e342f7597704e079df57ff5c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malware or visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://xn--80aab8aioy.xn--p1ai/userfiles/file/78685145806.pdf In PDF document text
    • https://dianthusindustrial.com/resimler/files/26924053354.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/duvikewevo.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/88968815731.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/vimefawaxaz.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/joxufawobubimodutip.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/sotonomuxoxumusolijomakig.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/66867060939.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/kujojererumogusidoluva.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/83314836819.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/35488613425.pdfIn PDF document text
    • http://blccy.com/userfiles/files/97316838323.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/1311771290.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/14742955571.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/rufufinu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/90284583858.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6a0b9913927db50f775822cbec2a87a4/wivabodonokip.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/99666981013.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/tipinefibupimavaboraviw.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/wiposeloxij.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/85333264980.pdfIn PDF document text
    • https://zzwgjx.com/d/files/62943969693.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/43207974399.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e86082ab4---94968830249.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/7000112775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=winrar+32+bitPDF link annotation
    • 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_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 17696 bytes
SHA-256: cb118de01c63f48c1bb2b2763dfe7562e91484bae5f42f471e5e0c1cf5b4a993
font_01_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 10060 bytes
SHA-256: 6b664e997531f308202f755f2996c7ea4c0ac93c0f94d404bc08e5f7cda4c297
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1