Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a96f0912091e7b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-19 06:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3aaa55a415253b4e25349fa3f78ba02d SHA-1: 10b97f5aaece555b2e74f81fc26d65d0aa55ee92 SHA-256: 95a96f0912091e7b42762bbf52fa4b015c91f002acd2e66ff3ada15b9d7bac82
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, suggesting it is used to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=linearlayout+set+background+drawable+programmatically PDF link annotation
    • https://cochleartudaskozpont.hu/files/tidujurisarudukeloza.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/12647035972.pdfIn PDF document text
    • http://strandedtattoo.info/file/gupuzusigen.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/48688d822970f310d5264095848ed710/75498983654.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/takotirabexenineta.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219112145405180.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/mofugugufarirukir.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/jixararorowibejefajimat.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/30925572155.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434d139293f---7917746144.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210918_ADF4F51868C271F8.pdfIn PDF document text
    • http://dentherapia.hu/files/file/27174762945.pdfIn PDF document text
    • https://0900107678.com/upload/file/zodemu.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/8903245527.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/nopejenufufunevukegelob.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/xebudusizutusir.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/24703307880.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/87324431299.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/48484338470.pdfIn PDF document text
    • http://yoron.net/up/files/57731278495.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/91851415931.pdfIn PDF document text
    • http://telecycling.org/files/file/fusegede.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_off0000b08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 11348 bytes
SHA-256: a6c3cac1b85dfd511dd86c1978ee5d108bfcba663ac67ee7d3d431e01cabb2e7
font_02_sfnt_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 14264 bytes
SHA-256: d6404f196045856eb26d5522ce1bc9d5d0811e4767422a0fbe2f28f6499f7db7

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