Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52f4499bcfc28d7…

MALICIOUS

PDF

34.9 KB Created: 2020-06-18 00:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280f641f9dcf21872edb1218089e0d2e SHA-1: 52494aa1e36c14e54a0cac43f255752a6d76ba1d SHA-256: c52f4499bcfc28d71d28790fb59d5fd01785a5d9e7e438a4fcaf58a6536297f7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the primary malicious activity appears to be the distribution of links.

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://onkoyoga.com/uploads/1/3/1/8/131859993/131859993.html#fireberd+6000+manual+pdf
    • http://holisticrootsnutrition.com/uploads/1/3/0/9/130968913/952d934d886f2.pdf
    • http://hostmaster.reinheitcolditz.de/uploads/1/3/0/6/130639129/6edbcfa35d8c.pdf
    • http://1fp.undesirable.us/uploads/1/3/0/4/130483844/didusapamanimo.pdf
    • http://mx.e-history.org/uploads/1/3/0/6/130620519/8549677.pdf
    • http://mail.thefinalenemy.com/uploads/1/3/1/4/131455825/8bd50fce9b71a.pdf
    • http://ktofineart.com/uploads/1/3/1/1/131164475/korumus.pdf
    • http://6875willclaytonpkwy.com/uploads/1/3/0/7/130740110/saneba-nupexujikef-xisegu-sededizozo.pdf
    • http://capecove.net/uploads/1/3/0/4/130492229/336a8f978f8426.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_off00005091.bin
7c1d052e1315e33c3744aae0880e81786b16c2c6e644a14c6b408640607b4fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5091 5092 bytes
font_01_sfnt_off000061a8.bin
987ac1d54b0ca5ab94599ed85f6182fa0fb6d33f1ffea9413ba0ef174f097793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A8 8820 bytes

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