Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd59864779bf19ff…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 12:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 144a2f6d67b8dc30c98b6bddd0546379 SHA-1: 4e6fe7d2de617a915b6663b7023e1fd79306b22a SHA-256: dd59864779bf19ffd9ceceb24479c7a783e05381cbc156029a422e2157b21fb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection suggest it may be used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://myparrotfood.com/user_files/files/sokudis.pdf In PDF document text
    • http://musicpark-live.com/userfiles/file/regaxefek.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149737687f31---41052835124.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/2520135813.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/76498334707.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/47083620870.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/norer.pdfIn PDF document text
    • http://mousike.it/img_ins/files/38153279857.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/zuxepijuzanin.pdfIn PDF document text
    • http://hoachattn.com/image/files/52449571151.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/lelowipawerinimezugobuni.pdfIn PDF document text
    • http://kunbot.com/upload/files/juwekuzupexedudasiruro.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/jowikunepipoxotopanijeder.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210910152458173799365.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/savejibutesobotatavat.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/76675761686.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/9786648086.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/jogoberelemaki.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/60961989921.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8379991985.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/wafasamukojeposurozofimo.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/33477464197.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vubowu.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/sexuxajewajemubinoposu.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/nobevufuzasamaxofiwopuro.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/78434426763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=qr+code+lord+sprigganPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/podeme.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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 15780 bytes
SHA-256: 05f0e2aab13975fa0eb20c572b4cc384e2081a5bd008da463eb1d2e6ead1ffe3
font_01_sfnt_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 10648 bytes
SHA-256: deb1f8fc2b3d3f36bd8f548528a7c696170b13d0827b5fee93cbcc668bcad683
font_02_sfnt_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1