Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9d6d193e489364…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 14:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afa33337bb23f8189c0b099eb49a4bcf SHA-1: ff0a1b24e33d6d05a7c0d3b40c6fe4f8dfbbd0a3 SHA-256: bf9d6d193e4893641b0b70ec8f816a931fa9fbf29d43dcbd2f6feb28e36a7bab
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL distribution suggest an attempt to redirect users to potentially harmful content, aligning with a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 4

  • 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 http://lasermedia.cn/userfiles/file/66704799590.pdf In PDF document text
    • http://simpelms.nl/userfiles/files/donetukakukem.pdfIn PDF document text
    • http://espokebar.com/uploads/files/80422584542.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/mosorudivesuna.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/13257276269.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/falumunebasixunaj.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/74040703899.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a73eae75d---28086771160.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/zakarasox.pdfIn PDF document text
    • http://skia22.ru/pic/file/mirogotajazozabetevujixek.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/jirugonekuvedoxirone.pdfIn PDF document text
    • http://suaups.net/userfiles/file/duvanubabiruvidebik.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109172054568671.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210904_38C62DA35069D6A8.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/52198661030.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/73684170075.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puzuwukefomebesigogesewi.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/lejabeviwedurovuze.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/wivefegojobeje.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/kemegefudosiveradinijum.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/bujupatibagan.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/60353351964.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/39769402503.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/pezok.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/rumepapokikarajomu.pdfIn PDF document text
    • http://azizolace.cz/images/file/4920148779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=why+internet+is+not+working+in+my+phonePDF 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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 17900 bytes
SHA-256: b1b433126eae16c9b8c66c1857964f0db83efa5da671ee3d64e6e7fd6dde0834
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10776 bytes
SHA-256: e8a33a428f4b32c0102b1d5ca075eb91ebd4e5f0828d5e1eba38bf42cdeb28af
font_02_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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