Malicious PDF — malware analysis report

Static analysis result for SHA-256 8139fd500715cb50…

MALICIOUS

PDF

72.0 KB Created: 2020-06-03 14:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e226087854886b6444b0905892175746 SHA-1: 1bc3c14cd9c45369c98fee5abef3e724ab00ac01 SHA-256: 8139fd500715cb508ca1c9ec4b80ef2e75d508d78615f1f969c822de26b08d13
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to suspicious domains. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ufefeosas8613.shop/uploads/1/3/0/2/130289530/130289530.html#m%25C3%25A9thode+essai+anglais
    • http://cyber-plus.net/uploads/1/3/0/2/130288542/9991e23.pdf
    • http://cfrsandiego-org.createbalance.net/uploads/1/3/0/4/130436181/4b34aa404.pdf
    • http://pooleconstruction.org/uploads/1/3/0/5/130539888/namalasewanub-tusanamokedawa-miwivad.pdf
    • http://ufefeosas8613.shop/uploads/1/3/0/2/130289530/terms.html
    • http://ufefeosas8613.shop/uploads/1/3/0/2/130289530/dmca.html
    • http://ufefeosas8613.shop/uploads/1/3/0/2/130289530/policy.html
    • https://datugonirir.files.wordpress.com/2020/05/rugafurira.pdf
    • https://kikibok.files.wordpress.com/2020/05/fizipuxudedikebewafa.pdf
    • https://kumoxiv.files.wordpress.com/2020/05/zodatenutekuvotemov.pdf
    • https://xofuridef.files.wordpress.com/2020/05/fabibisizazuxofe.pdf
    • https://xifudikez.files.wordpress.com/2020/06/mopoxetatidugofomet.pdf
    • https://fowetekiger.files.wordpress.com/2020/06/gokeveriruruf.pdf
    • https://zonutubuw.files.wordpress.com/2020/06/22615623814.pdf
    • https://faxonitu.files.wordpress.com/2020/06/jixufelizikiwivokoro.pdf
    • https://rolabetupi.files.wordpress.com/2020/06/vafenodanibevepivunifase.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095f7.bin
ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F7 6744 bytes
font_01_sfnt_off0000a6d4.bin
b97b21a68eb15dba8b22a06f0c9a1130736459aa7635a93b3d894843dd1ffcd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D4 13460 bytes
font_02_sfnt_off0000ca57.bin
b396af9e26415dc280bbf282544b3ed39c4cd8c45c0d0e939795b5b3dd5b432c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 12356 bytes
font_03_sfnt_off0000f0fc.bin
c1af0ba0449f9e3262a92a5df370d8387ccc6ecdc20401f94a6c95f805f4e5a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 17628 bytes
font_04_sfnt_off000109b3.bin
551918360585b1590efa6fd2a215345b2f702067d151a0e4b48cfa7490b57960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 1736 bytes

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