Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a0917efffdaa93…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 11:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11f15db76fa22ea3f8a3d19d1c00ac90 SHA-1: e6997004e90934a00c96ba71eaf3836ae924192a SHA-256: 78a0917efffdaa93d2076afbba7eb453e3d7e49279d3a4fbbbc256b77e728e9a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://infrive.ru/uplcv?utm_term=best+free+tv+show+apps+for+android PDF link annotation
    • https://spheresignal.com/app/webroot/userfiles/files/xutogiw.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/4782533983.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/riwubigaviwuzusitazi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f553c271e4---zifuvubinegixefijabiwej.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/48914890245.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/nafemigevokakodob.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/69881603174.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/45814343201.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/74553943142.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/38041769195.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/zufekadonipam.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/wodaboxitizuxojunogixuj.pdfIn PDF document text
    • https://beaszemin.com/files/33738804339.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/bagilaxinegukojanifudabin.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/71248793094.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/49527246337.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/21840492595.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/21636409575.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/91656276566.pdfIn PDF document text
    • http://fluorescent-training.com/file/badixafatezokezewaleju.pdfIn PDF document text
    • https://langumeistras.lt/i/File/jenawukaz.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/binojowagug.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_off0000beba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBA 16308 bytes
SHA-256: 93c2ec354c722e893c5d884690d6bca766aa79b3602c4f09045e6aa61c22791f
font_01_sfnt_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10752 bytes
SHA-256: eaf0dbf30d36b2bf7a6a67502867e1cbbafeeacf114e085c39f2489339cdb35c

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