Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c99f2606cb158d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 02:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6284b227f65b2aea698ce3bdd330c22e SHA-1: 7eb5d00c389d84513d429c6e60c55238ad18e864 SHA-256: c3c99f2606cb158d0b4b6a3467b7f83a7f044fcc8e13b1cfc01c73a49e77aafb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://benetalent.com/upload/files/mofoturemolomotogosuxupi.pdf In PDF document text
    • http://chromoink.com/updates/file/kewabogiviguriruvu.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/pimabagatop.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/23183652355.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/64787057284.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rukasrkr6h0gfasagdlquhvdc5/92376915820.pdfIn PDF document text
    • http://anninh247.info/upload/files/sitibezijumab.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/64799614519.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/mazizufedixetowizazul.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/kawaguzes.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/datogugisafowevigoxamanu.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/38333995162.pdfIn PDF document text
    • http://podushka.by/files/files/timipufifak.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210904195214.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/munuvuronorusudafokuremav.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/lenumodomapesaz.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/96044177057.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/34110307366.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/34732924301.pdfIn PDF document text
    • http://fullx.net/files/40986394308.pdfIn PDF document text
    • https://estoniapools.com/contents/files/dububobiwe.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/68173764863.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/fizoguzusumabuligipi.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/55588503940.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/42099508224.pdfIn PDF document text
    • http://come2menorca.com/images/file/rerifoposajub.pdfIn PDF document text
    • https://fivetc.net/uploads/files/12349566071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dirtiest+truth+or+dare+app+androidPDF 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_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 19248 bytes
SHA-256: 0d0d958dbf3c3badd761cd5e565d24f488fb2b09be527a2101fd1658e6bf4458
font_02_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 10544 bytes
SHA-256: c37adbdbcd840c8b0722b3468b13b3509ae0b7446a50b5f3c055545af2f8cc29