Malicious PDF — malware analysis report

Static analysis result for SHA-256 027fdcf624481a2b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 00:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6009694f4f17f327bcb13b768aefff6d SHA-1: d46027a69265f544ea33fec7d15dabebafe00150 SHA-256: 027fdcf624481a2b94e1f9155fadfdf43b4ac541ca6f0bb84752eb5624c6e5b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ketchas.ru/uplcv?utm_term=how+do+u+get+robux PDF link annotation
    • http://modaxch.com/userfiles/files/14576853045.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/51559067777.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/76319784289.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/81863296842.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/87747708412.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/47555053845.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/96335911648.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce6ba8dbc---68813973520.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/52690938160.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/fawato.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xigil.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/80416132123.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/44393659326.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/90631505954.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/71831135069.pdfIn PDF document text
    • http://starma.pl/files/file/15227532654.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/48768128968.pdfIn PDF document text
    • https://vientangluc.com/upload/files/9962925661.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/43484877654.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/jofuzok.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/bivefunubaxosodo.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/78743318468.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/tipapos.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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 17136 bytes
SHA-256: b9f2007e9a9517316e70e555a3be542c1b7e56443bc9eb2696645437bf3fedd0
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 10268 bytes
SHA-256: 1877ffcacf53a633bd5fdc3e7072d2b576db420cb23199d8c0858af44537132f

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