Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb38f8d0c5dc4d75…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 00:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 4e4f25ff4a55b9477ec5270b0cdbb8ff SHA-1: f549d07b8f92de1c69d3bdd9cbda09c18271b132 SHA-256: cb38f8d0c5dc4d754b92c00bc01ef5388d148703ef052f740379670a689581bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ketchas.ru/uplcv?utm_term=eurojackpot+app+android+download PDF link annotation
    • https://copab.tn/216mag.svn/uploads/files/nawexofubowojogoxe.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/pedasutubipajesibon.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/80348753235.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/tenovuwada.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/25307833275.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/suxavito.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/gijeloxevamapomo.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/mokowanez.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xolatajakajaso.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/90288182726.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/54627305099.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/bb62ef35019099793b72058df62ed457/tefexesokakonipimatoxog.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/61767037853.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/doseg.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/bamidogibitodilividuwexor.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/alv16vfr01l46o28ddmbrg2vu0/2277941558.pdfIn PDF document text
    • http://lobi.md/userfiles/file/lepisatapumotafofukute.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/dirajumajudumikedenimifa.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/90869125068.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/lidabojo.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/galipiporesetopoxaso.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/87125666943.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_off0000c7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F8 10596 bytes
SHA-256: a8592adbd0e1bd63baa63a65f3c366c2a7f3758a5b203f7cee80c8acbb3cca33
font_01_sfnt_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 17652 bytes
SHA-256: 30cb3e1f9c9df12de0b90ae1ff77ad52890ed8b33345bf2998be04a475bd03d4
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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