Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a900b630b7c6b8…

MALICIOUS

PDF

100.5 KB Created: 2021-09-18 08:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f94e32af966bc8f44f9c14c8c809fed SHA-1: 559623a14b8d343ef6e32e98f4a7041ab90f5fb2 SHA-256: 70a900b630b7c6b8beb5f326acaa74fe9ac4a96bc81ad0e863ddca77a29e22f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=android+telefonu+ios+7+yapma PDF link annotation
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/40605100798.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210910100914.pdfIn PDF document text
    • http://samtekelektrik.com/files/461748960.pdfIn PDF document text
    • https://synersys.fr/contenu/file/xuxogewadujime.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/26335781802.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48b35edc0---67006997587.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/64523312332.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/92888098446.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/taragek.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/29872951549.pdfIn PDF document text
    • http://gzwep.com/img/file/20219512116.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/40566079472.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/riruvinejojaw.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4gcrj62e4d11oj2e5hu1815eqk/mozotolo.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/23581553926.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061507166102.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/pukif.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/kumovuwujatagetavid.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/66275926081.pdfIn PDF document text
    • http://talesma.com/E/file/30500553400.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/23451555608.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/duwef.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/38921234078.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_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 10904 bytes
SHA-256: 1cc36b870b73576e2e1a0cce759d8c4605fdb3779bd121e727881d9e5bc3324a
font_02_sfnt_off000155a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A8 17800 bytes
SHA-256: e40b81b5f8e9b4ee7b99f41b9bdccd5e3f4fa92d99246b6d9e7cb2d995f6bfa2

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