Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd65ca70445451c9…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 19:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 917c09d1682a79ae43260cda20402b50 SHA-1: 955474c7efe561146c213943dea18645fc873392 SHA-256: bd65ca70445451c9b8264f6c6cccc70e281f20ce568f58b03fe13f11f345e4d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lead users to a harmful payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://maxbrio.kr/files/files/zakanisuwawamada.pdf In PDF document text
    • http://leeandrewdavison.com/download/72468096631.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5pqcuu6lqoj6c2t26nj9ag78c6/35434188495.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163160336354.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/pifopop.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/bekofakipusafaxivumeju.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/gujawubotakezej.pdfIn PDF document text
    • http://ruresept.ru/files/file/dipudisi.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/92465563956.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/lovepafigixijenogiwomasu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rolosadatasog.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/57405286523.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/maliminujomopumagisu.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/29901029825.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402af8d60ff---61278082443.pdfIn PDF document text
    • https://rubfila.in/files/file/zobodunadakuligosowifaker.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/61817502294.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/93025783165.pdfIn PDF document text
    • https://viceda.com/userfiles/file/17665356784.pdfIn PDF document text
    • http://elitacasa.it/images/file/lowexasavadakeneporopile.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/notesemoxozavuxu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/notirejinamuver.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hunter+x+hunter+season+1+episode+1PDF 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_off0000b7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 10688 bytes
SHA-256: 1deef637af41b424a9116292877e6c7d2ae7ed6a4693668d3b7ae66149791bd3
font_02_sfnt_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 16724 bytes
SHA-256: 3f8e4542667060b268e92470d81abb0ccf08262690935eca233dfb316ace93af

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