Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a1ea79f45ddca1…

MALICIOUS

PDF

64.0 KB Created: 2020-05-25 19:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc260b2e487a1b93405655bfefa51912 SHA-1: 2a820fecd923e47ed6dc026eb3cfc4923205b932 SHA-256: b7a1ea79f45ddca14aae7bb5a0fd85c401cf007c239243967c9e3f99ea306f75
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, though partially corrupted, contains references to URLs that are also present in the list of extracted URLs. These URLs point to various domains, suggesting a link farm or a distribution network for potentially malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://1am.undesirable.us/uploads/1/3/0/5/130542692/130542692.html#libros+de+ciencia+ficcion+2017
    • http://karateswapmart.com/uploads/1/3/0/6/130620512/fowuvo_jarovefi_jalokos_labizelubasixu.pdf
    • http://walkerstitans.com/uploads/1/3/0/8/130873810/batasobewu.pdf
    • http://blackzenithagency.com/uploads/1/3/1/4/131453316/6167098.pdf
    • http://hostmaster.writinginhighheels.com/uploads/1/3/1/6/131606183/c222a.pdf
    • http://genevieveglam.com/uploads/1/3/1/6/131636764/tozofugelokozapakafi.pdf
    • http://pc19.xingmc.de/uploads/1/3/0/5/130551534/nivazerafuxazexum.pdf
    • http://srpsaveontravel.com/uploads/1/3/0/4/130483147/javipegefuxip.pdf
    • http://fanshuixinyuyulecheng.br3h.com/uploads/1/3/0/7/130740110/soguxudegiziji_lisebix_nisuzin.pdf
    • http://blanketwhale.com/uploads/1/3/0/6/130639138/3995649.pdf
    • http://princestreetam.com/uploads/1/3/0/5/130540554/3634bee1b95038b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b59c.bin
ef22b5311ef30c46b94db7a86fd5854359a9d0cb5174ba5767431685a5dd81bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB59C 11988 bytes
font_01_sfnt_off0000dccd.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 16312 bytes

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