Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df071cd45a01486…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 16:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4455d0caa686029250dd476b78c3913 SHA-1: 24b23bff96841494034ac47ed96eaaf173b96502 SHA-256: 0df071cd45a0148666b70c7627d0fbde855a71a40ba05ec2c6fa4d0d0f9a080a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://superfasttv.com/uploads/files/pewajekamolilateji.pdf In PDF document text
    • https://sona3elkhair.com/userfiles/file/vimuvujuradiwajafuvinen.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/tudobozun.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/powifexuratimurinusezivak.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/kibemewelolepo.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/damafapukulobuniwu.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/sawidutet.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vidutifov.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/96548280968.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/50057830640.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137120b9b708---97997626669.pdfIn PDF document text
    • https://pcetravel.com/files/file/62287671438.pdfIn PDF document text
    • http://newcityhk.com/userfiles/sojemimasaderigagij.pdfIn PDF document text
    • http://minhanh.com/files/bamewiso.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/gumudowubesepi.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/44803963093.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/nupilinikosegumadelugotek.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/26656437408.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/xulonaj.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lcp3bp1mg3u162tc4up19ctlrk/likerupezonujuzu.pdfIn PDF document text
    • http://poiskvod.ru/images/file/46955951705.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613123d8890a4---lonituzikilox.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/16731874329.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/dekivelojanozowuw.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/pobamozopulaxuwow.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/sirataniromepuzirebesa.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/febexabesibozabenorul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=avg+antivirus+free+per+smartphone+androidPDF link annotation
    • 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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 11044 bytes
SHA-256: 3db21670a26b33e2667caee3aae383f8afec614a2d2fce7efbf47c76e36b042b
font_01_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 18036 bytes
SHA-256: f4c95d54f7c18d4946b1f5440871f88a91f669514309e3bccf28c8698524a2e5
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1