Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4831499b78d3a0…

MALICIOUS

PDF

96.8 KB Created: 2021-09-16 22:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dd8f53c82b7fb7db23c55cc2a8e613f SHA-1: e40b174328743d555746dcecc5f9064ef8e3f522 SHA-256: 1f4831499b78d3a060e698878e58d7621810997e1843facbde81acf5f713f923
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=preposition+worksheet+for+class+9+pdf PDF link annotation
    • https://trinityautorepairs.com/uploads/files/80631606267.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/zowakujabi.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/goxujexubadipizojewo.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/96123366595.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/25573146794.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109111528454063.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/tegepuzot.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/ludiramavojesenez.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/difomiz.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zavajes.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/tegasokokeneva.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/52498003267.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/3862795675.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161419d9f80f12---86624859941.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/65571031103.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nibiberigegelakitajujidal.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210901210749.pdfIn PDF document text
    • https://le27.fr/docs/file/73740973405.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/8347937017.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pmm4asjp26p0d2gr3opfia85dg/falat.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/47131638385.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/62507337846.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/81946641249.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_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 11064 bytes
SHA-256: 9eb56ceccce2076e18ae0662ec3a10a1c17aa25dc73289f84d07976c73c68ee1
font_01_sfnt_off0001301a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001482c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482C 17704 bytes
SHA-256: 5148e0e1cb5bb90421b1635cfd3f87cb59cbf0bf9ede6c7df98225c90f083575

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