Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf3c8ff6fbde2df…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 23:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 417664512a015f92403cf8042311c566 SHA-1: 3ceb3c1b6fdf5b126fc91196a82ac451716057a3 SHA-256: 4bf3c8ff6fbde2df5e7016e49be332c743cb651444c0b9bac3f91e22a948809b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the document's primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=top+10+3d+games PDF link annotation
    • https://davnosti.ru/upload/nazudorekomebebepamaz.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/72253455427.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///dumemer.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/gogosanekome.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/10090099259.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/serimomiroweni.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/8904124224.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62714685155.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/68995423019.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/zazawudo.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913140645.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/93551341175.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614123c3ada49---81730306465.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/banupijuvota.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/xekululuxejepamejufumov.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/94281015542.pdfIn PDF document text
    • http://ducnhua.com/upload/files/mesiderunubumerinibofi.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/3621860734.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bamugop.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nojrg08u27gd1svqub9cr885o3/9051544611.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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 10604 bytes
SHA-256: 0d48f22e2cfe2e1860a71a30fea2ae630408e9e8049af6e78732dc0566e3ea58
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 17460 bytes
SHA-256: 56802828745171502abfc87477c7361c1d61de3acc27fe6bfdaa2a8ad5ed24f2

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