Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db6d2028f29c016…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 01:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 602ba708814b4b954ff87e05b623b758 SHA-1: 831866210ed4618baabbe40ff481ea9b75bf0ae7 SHA-256: 6db6d2028f29c016d08a9c669f0d26e67d20137b8900a3ee9e692a5c1c88c364
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to host PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a malicious intent to distribute content or phish users. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=pcap+reader+apk PDF link annotation
    • http://brickchamber.com/ckfinder/userfiles/files/visosamijetofidiba.pdfIn PDF document text
    • http://kbchina.de/upload/fuzakixav.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9ac4a10e1---tozebenufajexulugomozad.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/34306529473.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zibomanufufa.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/bexuxavosanorogimizatej.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/fejamaribuditepukid.pdfIn PDF document text
    • http://christopherdallo.com/file/77770960027.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/tiwukoxezaxetelemamafela.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/nenumijetijosesixuf.pdfIn PDF document text
    • http://meta-min.com/files/10432785941.pdfIn PDF document text
    • https://panama4d.com/contents/files/24798733090.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/tujoxebobifofewelegumu.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/89796587122.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/fuxunibewevovolad.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/suteratanulupesejefavej.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/buvubomapom.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/59224701276.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/egikepanukorifovixe.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/suzogi.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/8163472903.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/40582398671.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210901091134622.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/32003159576.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/57548355959.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_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 9972 bytes
SHA-256: e2e2221a0e222473a0cec062bd7f775c195c8a6da0d3946d56c39ff43b8034cb
font_01_sfnt_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 16168 bytes
SHA-256: d499f53de84d6369a8ef2a1b408afb4dbac912e70c7c00d1a2622daa804bdb90

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