Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5849d0066372d0…

MALICIOUS

PDF

67.3 KB Created: 2020-06-12 09:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9da20a40894d52f4b7b97dc94cc6c9c SHA-1: 762656c5b17278b7fdfe4ae2c5ee1fdafabeafc1 SHA-256: df5849d0066372d0b7c9eb401f1b2f946d2e4e8f8bc8f014cc697c70132a3c0a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'Indian railway permanent way manual pdf' and URLs that are likely intended to deceive users into clicking them. The primary attack pattern involves redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bet365touzhu.br3h.com/uploads/1/3/1/0/131070112/131070112.html#indian+railway+permanent+way+manual+pdf
    • http://samanthabcare.com/uploads/1/3/0/4/130476079/mawajak-tugavagew-wifanur.pdf
    • http://jgtorresenterprises.com/uploads/1/3/0/5/130590047/4991785.pdf
    • http://erikasvisions.com/uploads/1/3/1/4/131409055/divuwetutux.pdf
    • http://webmail.rekindledorganizing.com/uploads/1/3/1/4/131453950/pabeladufoku.pdf
    • http://meridianintranet.com/uploads/1/3/1/6/131636758/63189164d03.pdf
    • http://jamilystreasures.com/uploads/1/3/0/5/130589108/4d93e8def72c4.pdf
    • http://glennstricklandpainting.com/uploads/1/3/1/4/131483197/5f6ab778429.pdf
    • http://deutsh.travelmittelamerika.com/uploads/1/3/0/6/130639869/9663244.pdf
    • http://ns.taucrossregion.org/uploads/1/3/1/3/131381607/lasigus.pdf
    • http://lkdavisfinearts.com/uploads/1/3/0/4/130490378/fotazum.pdf
    • http://reytgoodpubs.co.uk/uploads/1/3/0/5/130588659/wolipudagaziwa-toriminuzikumov.pdf
    • https://piwelil.files.wordpress.com/2020/06/jogiserumox.pdf
    • https://levarip.files.wordpress.com/2020/06/lutakudewetawuvi.pdf
    • https://sowapije.files.wordpress.com/2020/06/84936112173.pdf
    • https://lebavop.files.wordpress.com/2020/06/24387164968.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db38.bin
3de06ba61d38e89c10dc90af894cb4cacec1e289755a203a886c898fc83e1302		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 11156 bytes

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