Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f53c5bde8017d8…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 12:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff4887c384222ba2824928c60256a679 SHA-1: 845a64a957e77cae034dc82002a68c24d5e79c8a SHA-256: d4f53c5bde8017d8ea094d7e5e487b8cbfda6637333148e505b35d6f662e2c7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://muntepa.com/userfiles/files/tifebivosifarekabijigud.pdf In PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/15157706285.pdfIn PDF document text
    • http://15881588.com/ckupload/files/19843356605.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161415bb03eed0---54480972788.pdfIn PDF document text
    • https://emenu.hu/editor_up/14336838302.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/87303731434.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/80537088609.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/941259360.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/golefuzujopuvimezazas.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/jagif.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/34945906503.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/potutupulo.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/80746914323.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ede246ca---93642857243.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/dewapar.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/10724191789.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/82462703763.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/gabikudosojixizovaz.pdfIn PDF document text
    • http://irths.com/upload_files/files/22696998620.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/fasarunademekap.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/38080384121.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/vokuvunonorelipeguvubofik.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/43233698561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pubg+mobile+aimbot+hackPDF 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_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 17672 bytes
SHA-256: 137045bf377ee36fe2fad5c07f48f58bd179c13b23c7567e5374e7d8613289be
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 10640 bytes
SHA-256: aa05b951dc7ee971fbf103364bbe175b05e9afba80b6084fee99f59de307551b
font_02_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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