Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2d516f83b3e795…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 09:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc1a7325739b171e2c40c9bc19b7f41e SHA-1: 9000e1239f57671592bbb3579a8a4ca2986aede9 SHA-256: 8d2d516f83b3e795ff40ebd65e8b143cfbb91251d3c458298675a2cdcc477b54
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 malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=how+to+install+videoder PDF link annotation
    • http://tlumacz-lipno.pl/pdrzewiecki/files/32083159000.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/56308491747.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/87202094664.pdfIn PDF document text
    • https://il-gusto.com/images/file/kuvanawuwexekowamanitoja.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/71260613179.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/55128092605.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/zixebufuba.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/88558481577.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65608547018.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/farapufukumaduvomajevitij.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/39950995978.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb685aacae---zanuxit.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/98345776680.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/wuvijelekademimowebeve.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b241965f---8643968202.pdfIn PDF document text
    • https://people11people.gr/uploads/File/kazitejegeninewonudel.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/36549550795.pdfIn PDF document text
    • http://mobil-tech.com/files/12069688504.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/megirimofizunufexezoledi.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210911202314.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/gevodoromumibob.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/7050413133.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_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 10384 bytes
SHA-256: 1220414388708f784854a66e6a80e1ae6f0271aa8665c779dc169f73e4d56fca
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 17356 bytes
SHA-256: ba418f465168be40bb64c99be164dd43e8570edcf9e42318e9aae3e3303ca383
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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