Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0044120d81f19ac…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 08:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93d4b6431c887903a7e538a1759e7f0c SHA-1: f7fe3c33a5326514eadf90c8f3ebfaff4ca01f08 SHA-256: b0044120d81f19ac4280c7adba29d026afdab7ec6f356407717ab597894f97d1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded URLs, many of which point to disposable domains or are part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, possibly for SEO manipulation or to redirect users to malicious content. No scripts were extracted, but the structure suggests it's designed to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.trisad.kz/ckfinder/userfiles/files/dalizag.pdf In PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/zorexorefumeludabuki.pdfIn PDF document text
    • https://eklyps.net/images/file/59366360632.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/nulerozixexowa.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/metefafut.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/95860782515.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/toduwixefazopubeluw.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/tepovudinatoxurapereted.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/35975589426.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/45088760017.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/dilifamaf.pdfIn PDF document text
    • http://labradory.pl/file/dujeb.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/45375076385.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb62a0ef05---37581352846.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/72064406453.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/lenuva.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910102053.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/mimaseferobajejabujobip.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/36759712091.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/bujujokurev.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/99669550480.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/zajemusikuna.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/14028091503.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/89514825006.pdfIn PDF document text
    • https://bdata.vn/upload/files/neregebevisu.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/gamux.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/73677748009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=types+of+intersecting+linesPDF 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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 17704 bytes
SHA-256: 0b61cf9df2e0fb97a0e055183b70827c2e245c1c801717ec8da14224051e931a
font_01_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 10572 bytes
SHA-256: 5aedc03ab92382c21e7da4edb14c582e9f5dc68dc5d11c40a30bedcf24a2c713
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1