Malicious PDF — malware analysis report

Static analysis result for SHA-256 47687aba8db3cba5…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 22:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 15ae2e4b106d8a67edc0f862c0ac4598 SHA-1: 072e93915addc1c76daf84065f7965004c6b4ce4 SHA-256: 47687aba8db3cba53880103874f15fa39131113594298a70b49f0e3d56dcda4c
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external URIs, including one pointing to 'ketchas.ru' with a 'play666 apk download' UTM term, suggesting a lure for potentially unwanted software or phishing. The PDF structure itself is also noted as a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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=play666+apk+download PDF link annotation
    • http://thuocamakong.net/userfiles/image/file/maleduvogenu.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/16811405713.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-28/20210928182444743664.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/62500053761.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/bumomobixevirijisiwa.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/kobatupakikeza.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210921/file/16322383407010.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210906231216.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/wobofebefatitogibozafes.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/62027378092.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/11007953949.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/15128271157.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/32649571651.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nodexojezaru.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/81464350482.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/19007146998.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/wenotanejedewexogodago.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/51062621491.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/23131276027.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t05eql42qksau5ntosh3glsc3l/52097374645.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146e5d6e78---95344013175.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/20325194093.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/57577085101.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dipawidifuj.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_off0000b135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 10256 bytes
SHA-256: ede2353c6472c02402e595bad90b8227ba02bb631672e39a203927d95bbc1bf8
font_02_sfnt_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 15436 bytes
SHA-256: 23137a82f6239063166d50f36815be3669746e002ba9150db2ed5e94e0099e18

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