Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc9bfb0e528132c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-24 19:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ecab02fe45d076476e4a081dd50b9c5 SHA-1: 9051f6c14cb57638842285d372e2626e3d238284 SHA-256: fbc9bfb0e528132c8259a6db313a5aadd00c5bfc977d557da61e54bb7610c73b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=efectum+slow+motion+reverse+cam+fast+video+app PDF link annotation
    • http://nbc.ua/design/pic/file/zejeramurobaluloxigozus.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109231430389589.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631208404_867ac5273e.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/4993713887.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/90007481513.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/50032454560.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/79830357667.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/juxuwuwojuko.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/xezezi.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/widopawozobijaxuwefegokax.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24074067210.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/55257972736.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/44176359742.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/96548718812.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/70195583876.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/xidodubidekilage.pdfIn PDF document text
    • http://krzeptowski.pl/file/wegef.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/zudawonivewebetiwuboduw.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404067ec8a2---gofigozepizikixa.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/36029621305.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/55515897040.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/divarukaru.pdfIn PDF document text
    • http://newworldss.com/uploads/file/venuxene.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/3242843835.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_off0000b9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C3 11016 bytes
SHA-256: cf60de819747e24a3730fdf49dc58812639e49b026c8e0ad3e21511c3076d0c4
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 19152 bytes
SHA-256: e6a0b685a977953521fb73303a97f80e75817eef342c6267215439df1556c3bf
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1