Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9b50de210c23c3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 10:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d749284b28685b7bd2a4a9c3b6a631c3 SHA-1: 2462a7806758f1df0f4c1fa94b42c74a76f19afd SHA-256: 8d9b50de210c23c32c41dfec790f01645d74c880a24e4551ff1ff445eeb3db79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a large number of embedded links, many pointing to unknown or potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior as a tactic to distribute malicious content.

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 http://webbuilders.com/files/file/33385272358.pdf In PDF document text
    • https://hatinhjobs.com/upload/files/rotamubosatiduwakofel.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/gopugabamusulopasenexajam.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/peparifasukisexadegiwime.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/19323965889.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/wedibetejutafamavimajerat.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/jowid.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/91860389998.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/pevid.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/6860827574.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/wudekowewuligop.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22080fd39---49381448262.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/jimaxojodagubedawugemaje.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/pikanozitapixis.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/vumovozevowuk.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e81ea7b9f---47643958368.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/gemirirol.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/32786485604.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/63443691064.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/togurojesowonepekati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=where+is+the+recycle+bin+on+an+android+phonePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/95701498723.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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 17988 bytes
SHA-256: 8492a6f841c36342e465c37c808668212499f95211ce1c2720152cd38bc214b4
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 10860 bytes
SHA-256: cffd3e35cbdc936ff4ab996fe624b12a30e99918f09606581d1cf280bd22c7a1
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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