Malicious PDF — malware analysis report

Static analysis result for SHA-256 9958f59574f1e016…

MALICIOUS

PDF

73.6 KB Created: 2021-09-30 10:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd1b02aa21a504e8587f3bd2e43e68b7 SHA-1: 82671b993726e5493436ebfc37fcf1b5abd0b7ab SHA-256: 9958f59574f1e0167401b23be8ce4535977f197e5b6cdb11ec9d8aeae7367acf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to potentially disposable domains, further indicates a phishing or malware distribution attempt. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133b95fd8e41---gojakagebixevitene.pdf In PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/88544990038.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/92559047867.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/61930697339.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/nogemolulovolifixojediw.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/gowesonopaxegobalik.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/nitexufokuzudobifokod.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/xokuj.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/62a1ee568452427f6107fc3f13e6dd24/japunu.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/nivaforozuzulejelu.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/davodo.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/14149486202.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/limubafisemiwifexug.pdfIn PDF document text
    • http://le383.com/uploads/files/rifowa.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210926_830D6AEAF77B3DF0.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/45417368119.pdfIn PDF document text
    • http://24cvety.ru/upload/files/33605574343.pdfIn PDF document text
    • https://kapefashion.com/files/files/50838765021.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/refaliwotujuzufi.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/21427063945.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/gobakatixuwopafuxizugavoz.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/27296108072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ping+test+for+androidPDF link annotation
    • http://forum-auto.ru/data/files/duxoto.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_off0000b7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DE 10484 bytes
SHA-256: c15125011fb63ae04e58ad09b2bc2371bcfa743c14415b0e4d9837091949b37c
font_01_sfnt_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 19064 bytes
SHA-256: 30db59908597f72d3703b382be038d31e0041475df931cd71a1b774de082605f

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