Malicious PDF — malware analysis report

Static analysis result for SHA-256 58833332f127f2e8…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 12:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 9c4ad3cb25cc3b48b4697cbfaf31b33c SHA-1: 51c34dfa651053fb3f703f3b6bf1d3d02e2d33f0 SHA-256: 58833332f127f2e86dc9dcd09afc2eaa95bfc96c3e5c71218d2496ca4610ea64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=android+game+maker+apk PDF link annotation
    • http://farmaciafoglia.eu/userfiles/files/bitowem.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/41164860589.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/jeziwoxagom.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/kojeferonawu.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/dezaxadusa.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/suxapatadajeved.pdfIn PDF document text
    • http://qdjshg.com/files/file/39232614772.pdfIn PDF document text
    • https://mbbs.hr/files/46686698794.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/xetomaketuxowuwen.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/99069638485.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/baxebanevinikumitefe.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/13366487348.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/91117450401.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/nupenesixefo.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/44697485201.pdfIn PDF document text
    • https://dalba.net/other_files/File/wotexufekewaxobe.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/tisajetotix.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/11545030955.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/lobekuvunirojugemejuduzir.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/98701976980.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/13254985745.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/zugibirufoxujud.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/roluzovemowosogusamasu.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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 16732 bytes
SHA-256: 090522b8244f1895a9641ae0ddf00d1ca6378404381046a0fd2675983357777d
font_02_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 10496 bytes
SHA-256: a99f581bd1d4d57d55f3a42874f5b3d67e7fed558d82ad88f650c49e6b0b9b53

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