Malicious PDF — malware analysis report

Static analysis result for SHA-256 5527acb6f162bb1d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 11:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0434bdde416429756fae270376f2f544 SHA-1: 518911fd7367adbb29e2f1ab6744f120299fc615 SHA-256: 5527acb6f162bb1d94a7e1575b4e4e91d38978c1126d18bc612fb6830519a970
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://women-for-marriage.com/ckfinder/userfiles/files/17403789934.pdf In PDF document text
    • http://kyea.org/imageuploads/5766830163.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/90890402536.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zelamaxi.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/pekel.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/pejebuf.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/99815474533.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/liboduzuraxo.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/37220766947.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/xobojedakurepop.pdfIn PDF document text
    • https://membermimpi.com/contents/files/24037580071.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-04-15-32-09-53.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/28039176745.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631432859.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/sugafelugalupiwi.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/4959404525.pdfIn PDF document text
    • http://nemochem.cn/upload/files/91490284740.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/78482273138.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/lukanobirami.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zixuzosisosazerajom.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/sireva.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/52818074373.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/22268707744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+bedrock+mod+apkPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/49595251799.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_off0000bf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF88 10792 bytes
SHA-256: 382082491e851f1a5f975d665b3789ce90877156a89c64be9550220f835f6fb4
font_01_sfnt_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 16092 bytes
SHA-256: 99dcf9d78cfb0b13cd150f857794e480b662ba00b25f524b329efce2dc943eb4
font_02_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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