Malicious PDF — malware analysis report

Static analysis result for SHA-256 823382e9a28a7692…

MALICIOUS

PDF

87.3 KB Created: 2021-09-10 06:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8ed694919e788fcce9a35bab18cb303 SHA-1: 3fef7eb8aadf20f02a263bee24ad28ade4f9b279 SHA-256: 823382e9a28a769208fc57bde27a733be3a8ce924ae83eb47d4f84084c2c7a28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a link farm, as evidenced by the numerous URLs extracted and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, which suggests a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://znalac.com/userfiles/file/nilelesir.pdf In PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/fafoxuruzofubuvojamafaxe.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/41890373107.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/53145567984.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/visisidepukefuvoranuzemob.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/tezumavagolilu.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/danelepisexopekuwidel.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/sumuwu.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/giwavesavewoxikofitole.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/29544512595.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/sirarosunexelorobeziv.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/bomadubopemapodesitoli.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/86704674905.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/gurumafepofuxufolokaju.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/dekepelogivo.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/jezisotipu.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/daluzunojifowodexomufezok.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fee471686d9a9fba7ae1bfb0baa5f43a/5643091814.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/vubufikixapekapejor.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/lowafuxiwupadeku.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909051840.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/fe5532d22130b466efbe77560b829329/zivadeziwujomaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=anonymous+instagram+story+viewer+private+accountPDF 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_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 23444 bytes
SHA-256: bedca5a34551e28bf8d7338e9517b5d0ec2524bdfa2c40d3281dbba53abac1cc
font_02_sfnt_off00013566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 11016 bytes
SHA-256: 2c442241e083dbcbc3aacc9ba952e95a9d4d875106db92eafd8388ad084571d2

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