Malicious PDF — malware analysis report

Static analysis result for SHA-256 22894bb2f11196e5…

MALICIOUS

PDF

79.4 KB Created: 2021-10-11 22:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8e9bd3d4fe05568aed319159f45b4ecd SHA-1: 5c9b985399ff95646161f5b15459697d27323ef3 SHA-256: 22894bb2f11196e50318ddac8febe4709311839f2490a1a8e8bb6fc97197e018
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/00dd7b8f0e8792cad4e975b12c6672d3/lerujegekakopo.pdf In PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210910_B57905B0A909FFAC.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/nimefevonanosufuwaxug.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/63269949650.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/pubegesupijonipebofet.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/numeleputubetudekubul.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/55361223894.pdfIn PDF document text
    • http://nemochem.cn/upload/files/46998207455.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/tuledat.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lijuwob.pdfIn PDF document text
    • http://poultech.net/d/files/34322076119.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/46852197421.pdfIn PDF document text
    • http://1careglobal.com/upload/files/30596003259.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/wemamozelidupuliwape.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/lupar.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fbe7eb16a---88847174068.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/sofum.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/91162398693.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/87315495518.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/21876851373.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/38687671669.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/68102454877.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-26/20210926074643140197.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/widijofesewadal.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=chainless+double+crochetPDF 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_off0000ce57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 10736 bytes
SHA-256: 17d4d70c1ca361f69844485078172a173460af7af70d1e63e1133dfb957952d8
font_01_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 18972 bytes
SHA-256: a31220f2a11bc86e5403bbdfcd1e2194f1c68e5a9d7a31d530a8a2eaada0bf68