Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce8c6770c132632…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 05:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d2b5b4df8cec2ba52bbb0a647f6dccc SHA-1: 40e7816079e30cac586f6c5dac6e40516a98c6be SHA-256: 2ce8c6770c1326323d9fa0e8036285cd1e5385ac5ecc792890721efea1b8b7fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. 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 PDF documents.

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://chcial.ru/uplcv?utm_term=b1+english+test+pdf PDF link annotation
    • http://i-physiology.ru/upload/lubibabogomog.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/fefapanegafi.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/43329351899.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/xinunakejuzegutup.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/15696690522.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/35809348928.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16134920ce7285---96372424108.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/logogerevofiwajuf.pdfIn PDF document text
    • http://kezmosas.hu/files/file/tenufapanaruxipono.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/zuluwapigitevofusavulan.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/kuromoxonirawojus.pdfIn PDF document text
    • http://soupworld.de/upload/file/tojubeludaditiwijamizom.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/gutabiwofabuxijosorabe.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/73792006192.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/10946677970.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/65154798968.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/tabivusemosegodot.pdfIn PDF document text
    • http://moristas.com/userfiles/files/53973310351.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/79161982346.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/71682466877.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/32382614209.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/wupizubujub.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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 18284 bytes
SHA-256: 8480e0e429b3adc601e8c384803a6908c8234d7f8e8aaa1ca9a872bc7f30c4c7
font_01_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 10500 bytes
SHA-256: d5edae5cedcdb6bdfd5677e66aba288e900fd0aebe9f9c6d2a6531f65d1d951e
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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