Malicious PDF — malware analysis report

Static analysis result for SHA-256 224b98ea92cee820…

MALICIOUS

PDF

81.7 KB Created: 2021-10-04 20:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b3b0afa6aa759c73eee436568eb1fc52 SHA-1: 6d9a6d7190e38bf170ab395108da085c318b11cc SHA-256: 224b98ea92cee82007cbac26129cc4289052040bc22c5f63a16fc4e8effce65b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=how+to+save+music+on+my+phone PDF link annotation
    • http://allineers.morefriendship.com/upload/files/40347161579.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/dajobaza.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/alb8vd29hhk4mn1eg7o1ju75t2/sefovupudiputej.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/6831216514.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_FD0600FC25790580.pdfIn PDF document text
    • http://goref.ru/files/file/62384071180.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/bututafaraxojasirekok.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/mobavovutizalalisaxaxa.pdfIn PDF document text
    • https://vleek.com/uploads/files/voxutu.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/83894957197.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/19115979006.pdfIn PDF document text
    • http://kodemari.info/data/files/kejezatev.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/jabogubor.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161411ff2077e0---fixidesibi.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/tetesepasimepu.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/93726926764.pdfIn PDF document text
    • https://ms1oke.com/contents/files/wunopapabedazudoxo.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/nixeburekopox.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210904115538.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/tezadolixo.pdfIn PDF document text
    • https://bor-diing.com/upload/files/mewenakilupepuwuvezifuba.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/64045434947.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/54961404364.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/46778434805.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_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 10852 bytes
SHA-256: 6fbd582d60602f2df409440556bbaa0fc5a442a4e4cd7319bb027e37418029bc
font_01_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 20348 bytes
SHA-256: c0557c499cab2e6dd5c2a38b590b383f350c42f69e030b5e835f7177d4f3c777